1.

What is variance of a geometric distribution having parameter p=0.72?(a) 54%(b) 76%(c) 13%(d) 69%I had been asked this question during an interview.The origin of the question is Geometric Probability in portion Discrete Probability of Discrete Mathematics

Answer»

Correct choice is (a) 54%

The best I can explain: The variance of a GEOMETRIC distribution with PARAMETER P is \(\FRAC{1-p}{p^2} = \frac{(1-0.72)}{0.722}\) = 0.54 or 54%. However, the variance of the geometric distribution and the variance of the shifted geometric distribution are identical.



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