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The standard deviation of 25 numbers is ...

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

A

40

B

45

C

`40+(21)/(25)`

D

None of these

Text Solution

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The correct Answer is:
A
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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