Statistics Class 9th Mathematics Part I MHB Solution

Statistics Class 9th Mathematics Part I MHB Solution
Practice Set 7.1
  1. The following table shows the number of Buses and Trucks in nearest lakh units. Draw…
  2. In the table given below, the information is given about roads. Using this draw…
Practice Set 7.2
  1. Classify following information as primary or secondary data.i. Information of attendance…
Practice Set 7.3
  1. For class interval 20-25 write the lower-class limit and the upper-class limit.…
  2. Find the class-mark of the class 35-40.
  3. If class mark is 10 and class width is 6 then find the class.
  4. Complete the following table.
  5. In a ‘tree plantation’ project of a certain school there are 45 students of 'Harit…
  6. The value of π upto 50 decimal places is given below :
  7. In the tables given below, class-mark and frequencies is given. Construct the frequency…
  8. In a school, 46 students of 9th standard, were told to measure the lengths of the…
  9. In a village, the milk was collected from 50 milkmen at a collection center in liters…
  10. 38 people donated to an organisation working for differently abled persons. The amount…
Practice Set 7.4
  1. Complete the following cumulative frequency table:
  2. Complete the following Cumulative Frequency Table :
  3. The data is given for 62 students in a certain class regarding their mathematics marks…
  4. Using the data in example (3) above, prepare less than type cumulative frequency table…
Practice Set 7.5
  1. Yield of soyabean per acre in quintal in Mukund's field for 7 years was 10, 7, 5, 3, 9,…
  2. Find the median of the observations, 59, 75, 68, 70, 74, 75, 80.
  3. The marks (out of 100) obtained by 7 students in Mathematics' examination are given…
  4. The monthly salaries in rupees of 30 workers in a factory are given below. 5000, 7000,…
  5. In a basket there are 10 tomatoes. The weight of each of these tomatoes in grams is as…
  6. A hockey player has scored following number of goals in 9 matches. 5, 4, 0, 2, 2, 4, 4,…
  7. The calculated mean of 50 observations was 80. It was later discovered that observation…
  8. Following 10 observations are arranged in ascending order as follows. 2, 3, 5, 9, x +…
  9. The mean of 35 observations is 20, out of which mean of first 18 observations is 15and…
  10. The mean of 5 observations is 50. One of the observations was removed from the data,…
  11. There are 40 students in a class, out of them 15 are boys. The mean of marks obtained…
  12. The weights of 10 students (in kg) are given below : 40, 35, 42, 43, 37, 35, 37, 37,…
  13. In the following table, the information is given about the number of families and the…
  14. Find the mode of the following data.
Problem Set 7
  1. Write the correct alternative answer for each of the following questions. Which of the…
  2. What is the upper-class limit for the class 25-35?A. 25 B. 35 C. 60 D. 30…
  3. What is the class-mark of class 25-35?A. 25 B. 35 C. 60 D. 30
  4. If the classes are 0-10, 10-20, 20-30... then in which class should the observation…
  5. If bar x is the mean of x1, x2…..xn and bar y is the mean of y1, y2…..yn and bar z is…
  6. The mean of five numbers is 80, out of which mean of 4 numbers is 46, find the 5th…
  7. Mean of 100 observations is 40. The 9th observation is 30. If this is replaced by70…
  8. What is the mode of 19, 19, 15, 20, 25, 15, 20, 15?A. 15 B. 20 C. 19 D. 25…
  9. What is the median of 7, 10, 7, 5, 9, 10?A. 7 B. 9 C. 8 D. 10
  10. From following table, what is the cumulative frequency of less than type for the class…
  11. The mean salary of 20 workers is Rs.10, 250. If the salary of office superintendent is…
  12. The mean of nine numbers is 77. If one more number is added to it than the mean…
  13. The monthly maximum temperature of a city is given in degree celcius in the following…
  14. If the mean of the following data is 20.2, then find the value of p. |c|c|c|c|c|c|…
  15. There are 68 students of 9th standard from model Highschool, Nandpur. They have scored…
  16. By using data in example (6), and taking classes 30-40, 40-50... prepare equal to or…
  17. There are 10 observations arranged in ascending order as given below. 45,47,50,52, x, x…

Practice Set 7.1
Question 1.

The following table shows the number of Buses and Trucks in nearest lakh units. Draw percentage bar-diagram. (Approximate the percentages to the nearest integer)



Answer:

To draw percentage bar diagram, we find the % of buses and trucks with respect to total number of vehicles for each year.





Question 2.

In the table given below, the information is given about roads. Using this draw sub-divided and percentage bar diagram (Approximate the percentages to the nearest integer)



Answer:

Sub divided bar diagram


To draw sub divided bar diagram, we use the given table for each year.



Percentage bar-diagram


To draw percentage bar diagram, we find the % of permanent and temporary roads with respect to total number of roads for each year.






Practice Set 7.2
Question 1.

Classify following information as primary or secondary data.

i. Information of attendance of every student collected by visiting every class in a school.

ii. The information of heights of students was gathered from school records and sent to the head office, as it was to be sent urgently.

iii. In the village Nandpur, the information collected from every house regarding students not attending school.

iv. For science project, information of trees gathered by visiting a forest.


Answer:

i. Primary data, because the data is collected by the investigator himself by going in every class.


ii. Secondary data, because the data is collected by some other person and is being used by investigator.


iii. Primary data, because the data is collected by the investigator himself by visiting every house.


iv. Primary data, because the data is collected by the investigator himself by visiting forest.




Practice Set 7.3
Question 1.

For class interval 20-25 write the lower-class limit and the upper-class limit.


Answer:

For class interval 20-25,


Lower class limit = 20


Upper class limit = 25



Question 2.

Find the class-mark of the class 35-40.


Answer:

For class interval 35-40,


Lower class limit = 35


Upper class limit = 40


Now,







Question 3.

If class mark is 10 and class width is 6 then find the class.


Answer:

We know that


Class size = upper limit – lower limit


⇒ Upper limit – lower limit = 6 ……(1)


Also, 


⇒ Lower limit + upper limit = 2× 10


⇒ Lower limit + upper limit = 20 …..(2)


Adding (1) and (2)


⇒ 2(Upper limit) = 26


⇒ Upper limit = 13


And lower limit = 7


⇒ Class = 7-13



Question 4.

Complete the following table.



Answer:


For class 14-15:


Frequency = 35 – (4 + 14 + 4)


= 35 – 22 = 13



Question 5.

In a ‘tree plantation’ project of a certain school there are 45 students of 'Harit Sena.' There cord of trees planted by each student is given below :

3, 5, 7, 6, 4, 3, 5, 4, 3, 5, 4, 7, 5 , 3, 6, 6, 5, 3, 4, 5, 7, 3, 5, 6, 4, 4, 3,5, 6, 6, 4, 3, 5, 7, 3, 4, 5, 7, 6, 4, 3, 5, 4, 4, 7.

Prepare a frequency distribution table of the data.


Answer:

Arrange the data in ascending order.


3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,7,7,7,7,7,7




Question 6.

The value of π upto 50 decimal places is given below :

3.14159265358979323846264338327950288419716939937510

From this information prepare an ungrouped frequency distribution table of digits appearing after the decimal point.


Answer:

From the given value we can prepare following table.




Question 7.

In the tables given below, class-mark and frequencies is given. Construct the frequency tables taking inclusive and exclusive classes.

i.

ii.


Answer:

i. Class width = 15-5=10




ii. Class width = 24-22=2




Question 8.

In a school, 46 students of 9th standard, were told to measure the lengths of the pencils in their compass-boxes in centimeters. The data collected was as follows.

16, 15, 7, 4.5, 8.5, 5.5, 5, 6.5, 6, 10, 12,13, 4.5, 4.9, 16, 11, 9.2, 7.3, 11.4, 12.7, 13.9, 16,5.5, 9.9, 8.4, 11.4, 13.1, 15, 4.8, 10, 7.5, 8.5, 6.5,7.2, 4.5, 5.7, 16, 5.7, 6.9, 8.9, 9.2, 10.2, 12.3, 13.7,14.5, 10

By taking inclusive classes 0-5, 5-10, 10-15....Prepare a grouped frequency distribution table.


Answer:

From the given values we can prepare following table.




Question 9.

In a village, the milk was collected from 50 milkmen at a collection center in liters as given below :

27, 75, 5, 99, 70, 12, 15, 20, 30, 35, 45, 80,77, 90, 92, 72, 4, 33, 22, 15, 20, 28, 29, 14,16, 20, 72, 81, 85, 10, 16, 9, 25, 23, 26, 46,55, 56, 66, 67, 51, 57, 44, 43, 6, 65, 42, 36,7, 35.

By taking suitable classes, prepare grouped frequency distribution table.


Answer:

From the given values we can prepare following table.




Question 10.

38 people donated to an organisation working for differently abled persons. The amount in rupees were as follows:

101, 500, 401, 201, 301, 160, 210, 125, 175, 190, 450, 151,101, 351, 251, 451, 151, 260, 360, 410, 150, 125, 161, 195,351, 170, 225, 260, 290, 310, 360, 425, 420, 100, 105, 170,250, 100.

i. By taking classes 100-149, 150-199, 200-249... prepare grouped frequency distribution table.

ii. From the table, find the number of people who donated rupees 350 or more.


Answer:

i. From the given values we can prepare following table.


ii. The number of people who donated rupees 350 or more =4 + 4 + 3=11




Practice Set 7.4
Question 1.

Complete the following cumulative frequency table:



Answer:



Question 2.

Complete the following Cumulative Frequency Table :



Answer:



Question 3.

The data is given for 62 students in a certain class regarding their mathematics marks out of 100. Take the classes 0-10, 10-20.. and prepare frequency distribution table and cumulative frequency table more than or equal to type.

55, 60, 81, 90, 45, 65, 45, 52, 30, 85, 20, 10,75, 95, 09, 20, 25, 39, 45, 50, 78, 70, 46, 64,42, 58, 31, 82, 27, 11, 78, 97, 07, 22, 27, 36,35, 40, 75, 80, 47, 69, 48, 59, 32, 83, 23, 17,77, 45, 05, 23, 37, 38, 35, 25, 46, 57, 68, 45,47, 49.

From the prepared table, answer the following questions:

i. How many students obtained marks 40 or above 40?

ii. How many students obtained marks 90 or above 90?

iii. How many students obtained marks 60 or above 60?

iv. What is the cumulative frequency of equal to or more than type of the class 0-10?


Answer:

From the given value we can prepare following table.


Ans. i. 38


ii. 3


iii. 19


iv. 62



Question 4.

Using the data in example (3) above, prepare less than type cumulative frequency table and answer the following questions.

i. How many students obtained less than 40 marks?

ii. How many students obtained less than 10 marks?

iii. How many students obtained less than 60 marks?

iv. Find the cumulative frequency of the class 50-60.


Answer:


Ans. i. 24


ii. 03


iii. 43


iv. 43




Practice Set 7.5
Question 1.

Yield of soyabean per acre in quintal in Mukund's field for 7 years was 10, 7, 5, 3, 9, 6, 9. Find the mean of yield per acre.


Answer:







Question 2.

Find the median of the observations, 59, 75, 68, 70, 74, 75, 80.


Answer:

Given: 59, 75, 68, 70, 74, 75, 80.


Here, n =7


On arranging the data in ascending order,


59, 68, 70, 74, 75, 75, 80


When the number of terms of odd, the median is given as:



⇒ Median = 


⇒ Median = 4th term


∴ Median =74



Question 3.

The marks (out of 100) obtained by 7 students in Mathematics' examination are given below. Find the mode for these marks.

99, 100, 95, 100, 100, 60, 90


Answer:

Mode is the maximum occurring observation.


Arrange the data in ascending order.


60,90, 95, 99, 100, 100, 100


100 is occurring thrice, mode is 100.



Question 4.

The monthly salaries in rupees of 30 workers in a factory are given below.

5000, 7000, 3000, 4000, 4000, 3000, 3000, 3000, 8000, 4000,

4000, 9000, 3000, 5000, 5000, 4000, 4000, 3000, 5000, 5000,

6000, 8000, 3000, 3000, 6000, 7000, 7000, 6000, 6000, 4000

From the above data find the mean of monthly salary.


Answer: 


Question 5.

In a basket there are 10 tomatoes. The weight of each of these tomatoes in grams is as follows 60, 70, 90, 95, 50, 65, 70, 80, 85, 95.

Find the median of the weights of tomatoes.


Answer:

Here, n=10



So median = Mean of fifth and sixth observations.


Arrange data in ascending order,


50, 60,65, 70,70, 80, 85, 90,95,95




Question 6.

A hockey player has scored following number of goals in 9 matches.

5, 4, 0, 2, 2, 4, 4, 3, 3. Find the mean, median and mode of the data.


Answer:

Arrange data in ascending order,


0,2, 2, 3, 3, 4, 4,4,5


Here, N= 9







Median = 5th observation=3


Mode is the maximum occurring observation.


Mode=4



Question 7.

The calculated mean of 50 observations was 80. It was later discovered that observation 19 was recorded by mistake as

91. What was the correct mean?


Answer:

We know that



⇒ Sum of observations = Mean ×Total number of observations


Given mean of 50 observations = 80


⇒ Sum of 50 observations=80×50


⇒ Sum of 50 observations =4000


For correct mean, we will subtract 91 and add 19 to the sum.




Question 8.

Following 10 observations are arranged in ascending order as follows.

2, 3, 5, 9, x + 1, x + 3, 14, 16, 19, 20

If the median of the data is 11, find the value of x.


Answer:

Here, n=10



So median = Mean of fifth and sixth observations.



⇒ 2x + 4=22


⇒ x=9



Question 9.

The mean of 35 observations is 20, out of which mean of first 18 observations is 15and mean of last 18 observation is 25. Find the 18th observation.


Answer:

We know that



⇒ Sum of observations = Mean ×Total number of observations


Sum of 35 observations = 20×35=700


Sum of first 18 observations = 15×18=270


Sum of last 18 observations = 25× 18=450


While adding first 18 observations and last 18 observations, we add 18th observation twice so,


18th observation= Sum of first 18 observations + Sum of last 18 observations - Sum of 35 observations


⇒ 18th observation= 270 + 450 – 700 =20



Question 10.

The mean of 5 observations is 50. One of the observations was removed from the data, hence the mean became 45. Find the observation which was removed.


Answer:

We know that



⇒ Sum of observations = Mean ×Total number of observations


Sum of 5 observations = 50×5=250


Sum after removing one observation = 4×45=180


⇒ Removed observation = sum of 5 observations – Sum after removing one observation


⇒ Removed observation = 250 -180 =70



Question 11.

There are 40 students in a class, out of them 15 are boys. The mean of marks obtained by boys is 33 and that for girls is 35. Find out the mean of all students in the class.


Answer:

We know that



⇒ Sum of observations = Mean ×Total number of observations


Mean of marks obtained by 15 boys = 33


⇒ Total marks obtained by boys = 33×15=495


Number of girls = 40 - 15=25


And Mean of marks obtained by 25 girls = 35


⇒ Total marks obtained by girls = 35×25=8755


Total marks obtained by class = Total marks obtained by boys and girls = 495 + 875 =1370




Question 12.

The weights of 10 students (in kg) are given below :

40, 35, 42, 43, 37, 35, 37, 37, 42, 37. Find the mode of the data.


Answer:

Mode is the maximum occurring observation.


Arrange the data in ascending order.


35, 35, 37, 37, 37, 37, 40, 42, 42,43


37 occurs four times.


Mode = 37kg



Question 13.

In the following table, the information is given about the number of families and the siblings in the families less than 14 years of age. Find the mode of the data.



Answer:

From the data, we observe that 25 families have 2 siblings which is the highest so mode is 2 siblings.



Question 14.

Find the mode of the following data.



Answer:

From the data, we observe that 9 students have got 35 and 37 marks which is the highest so mode is 35 and 37 marks.




Problem Set 7
Question 1.

Write the correct alternative answer for each of the following questions.

Which of the following data is not primary?
A. By visiting a certain class, gathering information about attendance of students.

B. By actual visit to homes, to find number of family members.

C. To get information regarding plantation of soyabean done by each farmer from the village Talathi.

D. Review the cleanliness status of canals by actually visiting them.


Answer:

In option C, investigator is not collecting the data himself but using the data collected by the farmers.


Question 2.

What is the upper-class limit for the class 25-35?
A. 25

B. 35

C. 60

D. 30


Answer:

In the class 25-35, 35 is the upper-class limit.


Question 3.

What is the class-mark of class 25-35?
A. 25

B. 35

C. 60

D. 30


Answer:

Here, lower limit = 25 and upper limit =35




Question 4.

If the classes are 0-10, 10-20, 20-30... then in which class should the observation 10be included?
A. 0-10

B. 10-20

C. 0-10 and 10-20 in these 2 classes

D. 20-30


Answer:

These classes are exclusive in nature which means the classes are continuous. The class 0-10 include 0 and all the numbers less than 10 while class 10 – 20 include 10 and all the numbers less than 20 and so on.


Question 5.

If is the mean of x1, x2…..xn and is the mean of y1, y2…..yn and is the mean of x1, x2…..xn , y1, y2…..yn then 
A. 

B. 

C. 

D. 


Answer:





Question 6.

The mean of five numbers is 80, out of which mean of 4 numbers is 46, find the 5th number :
A. 4

B. 20

C. 434

D. 66


Answer:

We know that



⇒ Sum of observations = Mean × Total number of observations


Given mean of 4 numbers = 46


⇒ Sum of four numbers = 4 × 46 = 184


Also, mean of 5 numbers = 80



⇒ Fifth number = 80×5 – 184 = 400 – 184 =216


Question 7.

Mean of 100 observations is 40. The 9th observation is 30. If this is replaced by70 keeping all other observations same, find the new mean.
A. 40.6

B. 40.4

C. 40.3

D. 40.7


Answer:

We know that



⇒ Sum of observations = Mean × Total number of observations


⇒ Sum of 100 observations = 40×100 = 4000


For new mean, we will subtract 30 and add 70 to the sum.



Question 8.

What is the mode of 19, 19, 15, 20, 25, 15, 20, 15?
A. 15

B. 20

C. 19

D. 25


Answer:

Mode is the most frequently occurring observation. On arranging above data in ascending order, we get: 15, 15, 15, 19, 19, 20, 20, 25. Hence, 15 is the mode as it has the highest frequency( 3 times)


Question 9.

What is the median of 7, 10, 7, 5, 9, 10?
A. 7

B. 9

C. 8

D. 10


Answer:

Here, n=6



So median = Mean of third and fourth observations.


On arranging above data in ascending order, we get: 5, 7,7,9,10,10


⇒ 3rd term = 7 and 4th term = 9



Question 10.

From following table, what is the cumulative frequency of less than type for the class 30-40?


A. 13

B. 15

C. 35

D. 22


Answer:

Cumulative Frequency of less than type of the 30-40= sum of the frequencies of all the classes upto 30-40


⇒ Required cumulative frequency =7 + 3 + 12 + 13=35


Question 11.

The mean salary of 20 workers is Rs.10, 250. If the salary of office superintendent is added, the mean will increase by Rs.750. Find the salary of the office superintendent.


Answer:


⇒ Sum of salary of 20 workers= 20×10250 ...(1)


And Mean increases by 750 when salary of superintendent is also added to it.



⇒ Salary of superintendent + 20×10250 = 11000 × 21


⇒ Salary of superintendent =231000 - 205000


⇒ Salary of superintendent =26000



Question 12.

The mean of nine numbers is 77. If one more number is added to it than the mean increases by 5. Find the number added in the data.


Answer:

We know that



⇒ Sum of observations = Mean × Total number of observations


⇒ Sum of 9 numbers = 9×77 ..(1)


And Mean increases by 5 when one more number is also added to it.



⇒ New number + 9×77 = 82 × 5


⇒ New number =820 – 693 = 127



Question 13.

The monthly maximum temperature of a city is given in degree celcius in the following data. By taking suitable classes, prepare the grouped frequency distribution table

29.2, 29.0, 28.1, 28.5, 32.9, 29.2, 34.2, 36.8, 32.0, 31.0,

30.5, 30.0, 33, 32.5, 35.5, 34.0, 32.9, 31.5, 30.3, 31.4,

30.3, 34.7, 35.0, 32.5, 33.5, 29.0, 29.5, 29.9, 33.2, 30.2

From the table, answer the following questions.

i. For how many days the maximum temperature was less than 34oC?

ii. For how many days the maximum temperature was 34oC or more than 34oC?


Answer:


(i) Less than 34°C =8 + 8 + 8=24


(ii) Equal to or more than 34°C=5 + 1=6



Question 14.

If the mean of the following data is 20.2, then find the value of p.



Answer:




⇒ 606 + 20.2p=610 + 20p


⇒ 0.2p=4


⇒ p=20



Question 15.

There are 68 students of 9th standard from model Highschool, Nandpur. They have scored following marks out of 80, in written exam of mathematics.

70, 50, 60, 66, 45, 46, 38, 30, 40, 47, 56, 68,80, 79, 39, 43, 57, 61, 51, 32, 42, 43, 75, 43,36, 37, 61, 71, 32, 40, 45, 32, 36, 42, 43, 55,56, 62, 66, 72, 73, 78, 36, 46, 47, 52, 68, 78,80, 49, 59, 69, 65, 35, 46, 56, 57, 60, 36, 37,45, 42, 70, 37, 45, 66, 56, 47

By taking classes 30-40, 40-50, .... prepare the less than type cumulative frequency table Using the table, answer the following questions:

i. How many students, have scored marks less than 80?

ii. How many students have scored marks less than 40?

iii. How many students have scored marks less than 60?


Answer:


v. 66


vi. 14


vii. 45



Question 16.

By using data in example (6), and taking classes 30-40, 40-50... prepare equal to or more than type cumulative frequency table and answer the following questions based on it.

i. How many students have scored marks 70 or more than 70?

ii. How many students have scored marks 30 or more than 30?


Answer:


i. 11


ii. 68



Question 17.

There are 10 observations arranged in ascending order as given below.

45,47,50,52, x, x + 2, 60,62,63,74. The median of these observations is 53.

Find the value of x. Also find the mean and the mode of the data.


Answer:

Here, n=10



So median = Mean of fifth and sixth observations.


5th term = x and 6th term = x + 2



⇒ 2x=106-2


⇒ x=52





Mode is the most frequently occurring observation. Here 52 appears twice.


So, mode = 52.


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