Question

The Standard Deviation of the numbers $31,32,33\dots \dots \dots \dots .46,47$ is

• A. $\sqrt{\frac{17}{12}}$
• B. $\sqrt{\frac{47^2-1}{12}}$
• C. $2\sqrt{6}$
• D. $4\sqrt{3}$

Answer 1

Answer: (C)

S.D. $=\sqrt{\frac{n^2-1}{12}}(n=17)$
$=\sqrt{\frac{17^2-1}{12}}$
$=2\sqrt{6}$