The mean and standard deviation of a sample of size 10 were found to be 9.5 and 2.5 respectively....

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The mean and standard deviation of a sample of size 10 were found to be 9.5 and 2.5 respectively. Later
\( \mathrm{P} \)
on, an additional observation 15 was added to the
W
original data. The standard deviation of 11 observations is
(1) 2.6
(2) 2.8
(3) 2.86
(4) 3.24


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