The SD of 15 items is 6 and if each item is P decreases by 1 , then...

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The SD of 15 items is 6 and if each item is
P decreases by 1 , then standard deviation will be
\( \mathrm{W} \)
(1) 5
(2) 7
(3) \( \frac{91}{15} \)
(4) 6
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