The mean and standart deviation of five ...

The mean and standart deviation of five observations `x_1,x_2,x_3,x_4,x_5` and are 10 and 3 respectively, then variance of the observation `x_1,x_2,x_3,x_4,x_5,-50` is equal to (a) 437.5 (b) 507.5 (c) 537.5 (d) 487.5

A

582.5

B

507.5

C

586.5

D

509.5

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B

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