A data consists of..... | Statistics | JEE _MAIN _2019

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JEE MAIN 2019

09-01-19 S2

Question

A data consists of $n$ observations $x_1, x_2 \ldots, x_n$. If $\sum_{i=1}^n\left(x_i+1\right)^2=9 n$ and $\sum_{i=1}^n\left(x_i-1\right)^2=5 n$, then the standard deviation of this data is

Select the correct option:

A

$\sqrt{7}$

B

5

C

$\sqrt{5}$

D

2

✓ Correct! Well done.

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Solution

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