The mean and Standard deviation of a sample were found to be 9.5 and 2 – McqOptions

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1.	The mean and Standard deviation of a sample were found to be 9.5 and 2.5, respectively. Later, an additional observation 15 was added to the original data. Find the S.D. of the 11 observation.
A.	2.6
B.	2.8
C.	2.86
D.	3.24
Answer» D. 3.24

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