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Suppose a variable x takes only two valu...

Suppose a variable x takes only two values `x_1` and `x_2` with frequencies `f_1` and `f_2`. If s be the s.d. of x, show that `s^2 = f_1f_2 [(x_1 - x_2)/(f_1 + f_2)]^2`

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UNITED BOOK HOUSE-Question Paper 2016-Exercise
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