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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_

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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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Correct Answer - B
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