First slide

Introduction to statistics

Question

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

Easy

A

40
B

45
C

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

None of these

Solution

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

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