1.

For a data consisting of 15 observations x_(i), i=1,2,3,…,15 the following results are obtained :sum_(i=1)^(15) x_(i)= 170, sum_(i=1)^(15) x_(i)^(2) = 2830. If one of the observation namely 20 was found wrong and was replaced by its correct value 30, then the corrected variance is

Answer»

80
78
76
75

Answer :B


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