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JEE MAIN 2020
08-01-20 S1
Question
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 $p \neq 0$ and $q \neq 0$. If the new mean and new s.d. become half of their original values, then $q$ is equal to $\_\_\_\_$
Select the correct option:
A
-10
B
-20
C
-5
D
10
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
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Mathematics
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