Forty persons were examined for their Haemoglobin % in blood (in mg per 100 ml) and the results were grouped as below: Find Mode. Haemoglobin % (mg/100ml) 13.1 – 14 14.1 – 15 15.1 – 16 16.1 – 17 17.1 – 18 No. Of persons 8 12 10 6 4



Haemoglobin % (mg/100ml)
Class boundaries
No. of persons
Frequency (f)
13.1 – 14
13.05 – 14.05
8
14.1  - 15
14.05 – 15.05
12
15.1 – 16
15.05 – 16.05
10
16.01 – 17
16.05 – 17.05
6
17.1 – 18
17.05 – 18.05
4
Here, the maximum frequency is 12 corresponding to class boundary 140.5 – 15.05
fm = 12, f1 = 8, f2 = 10, h = 1 and L = 14.05
Mode
=
L
 +
       fm
-
f1


h




2fm
-
f1
-
f2












Mode
=
14.05
 +
12
-
8


1




2(12)
-
8
-
10


Mode
=
14.05
 +
     
4







6




Mode = 14.72 mg/ 100 ml. 

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