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13.Statistics
easy
The $S.D$ of $15$ items is $6$ and if each item is decreased or increased by $1$, then standard deviation will be
A
$5$
B
$7$
C
$\frac{91}{15}$
D
$6$
Solution
(d) 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