Standard deviation of 25 numbers is 40 . If each of numbers is increased by 5 , then new standard de

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13.Statistics

easy

The standard deviation of $25$ numbers is $40$. If each of the numbers is increased by $5$, then the new standard deviation will be

A

$40$

B

$45$

C

$40 + \frac{{21}}{{25}}$

D

None of these

Solution

(a) If each item of a data is increased or decreased by the same constant, the standard deviation of the data remains unchanged.

Standard 11

Mathematics

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