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Question: For a frequency distribution standard deviation is computed by applying the formula...

For a frequency distribution standard deviation is computed by applying the formula

A

σ=(∑fd∑f)−∑fd2∑f\sigma = \sqrt { \left( \frac { \sum f d } { \sum f } \right) - \frac { \sum f d ^ { 2 } } { \sum f } }

B

σ=∑fd2∑f−(∑fd2∑f)2\sigma = \sqrt { \frac { \sum \mathrm { fd } ^ { 2 } } { \sum \mathrm { f } } - \left( \frac { \sum \mathrm { fd } ^ { 2 } } { \sum \mathrm { f } } \right) ^ { 2 } }

C

σ=(∑fd∑f)2−∑fd2∑f\sigma = \sqrt { \left( \frac { \sum f d } { \sum f } \right) ^ { 2 } - \frac { \sum f d ^ { 2 } } { \sum f } }

D
Answer
Explanation

Solution

It is obvious.