Question: 2 2 . Differentiating with respect to the expressions on both sides of the equation ' q x = 1 ( 1 ) x 1

22. Differentiating with respect to the expressions on both sides of the equation 'q x=1 (1 ) x1=1 show that the mean of the geometric distribution is given by =1 . Then, differentiating again with respect to , show that "2=2 2 and hence that 2=1 2.

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