Q.

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

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a

40

b

45

c

40+2125

d

None of these

answer is A.

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