The mean and standard deviation |Statistics|JEE MAIN 2021

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JEE Main 2021

26-08-2021 S1

Question

The mean and standard deviation of 20 observations were calculated as 10 and 2.5 respectively. It was found that by mistake one data value was taken as 25 instead of 35 . If $\alpha$ and $\sqrt{\beta}$ are the mean and standard deviation respectively for correct data, then $(\alpha, \beta)$ is :

Select the correct option:

A

(11, 26)

B

(10.5, 25)

C

(11, 25)

D

(10.5, 26)

✓ Correct! Well done.

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