JEE MATHEMATICS MCQ: STATISTICS

1 Easy

1 of 1

Application +4 | -1

The mean and the standard deviation (s.d.) of 10 observations are 20 and 2 respectively. Each of these 10 observations is multiplied by

p

and then reduced by

q,

where

p \ne 0

and

q \ne 0.

If the new mean and new s.d. become half of their original values, then

q

is equal to

View answer and explanation

Correct option: D

-20

Option D (-20) is correct because it is the value of q that satisfies the given conditions for the new mean and standard deviation.

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