Question

The mean and S.D of $13,13,13,13$ are respectively ______.

• A. $0,13$
• B. $13,13$
• C. $13,0$
• D. $0,0$

Answer 1

The correct option is C $13,0$

In the given series, 13,13,13,13

Mean = 52/4 = 13

Since all the deviations will be zero. Therefore the sum of the deviations will also be zero.

Standard deviation = { sum of the deviations / number of terms}^1/2

= {0/4} ^½