Formula method:

x

=

b ± √ b^{2} – 4ac




2a

a_{1}

≠

b_{1}






Unique solution


a_{2}


b_{2}


















a_{1}

=

b_{1}

≠

c_{1}




No Solution


a_{2}


b_{2}


c_{2}
















a_{1}

=

b_{1}

=

c_{1}




Infinitely Many Solutions.


a_{2}


b_{2}


c_{2}






P(A)

=

n(A)



n(S)

Mean
by Direct Method

x̅

=

Σ fx









Σ f















Mean
by Assumed mean Method
or
Shift of Origin Method

x̅

=

A + d̅















Mean
by Step Deviation Method
or
Shift or origin and scale method

x̅

=

A + hu̅















Median

L

+

(^{N}/_{2} – cf) ^{h}/_{f}















Mode

L

+

f_{m} – f_{1}

h








2f_{m} – f_{1} – f_{2}






Central
angle (θ )

=

Value
of the component

×

360







Total
Value of all the components






