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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