Question
Let X be a gamma variable with parameters and
, having
and
. Find
and
. Also, find the m.g.f. of a gamma variable, and hence verify that mean of X is 6 and variance of X is 3 using m.g.f.
b) For married couples living in a certain locality, the probability that the husband will vote in a school board election is 0.21, the probability that they both will vote is 0.15. What is the probability that
i) at least one of them will vote?
ii) neither of them will vote?
Answer :
Word Count : 296
Let X be a gamma variable with parameters α and λ, where λ is the rate parameter. For a gamma distribution, the mean and variance are given by E(X) = α/λ and Var(X) = α/λ². Given E(X) = 6 and Var(X) = 3, we have α/λ = 6 …(1) α/λ² = 3 …(2) Dividing (2) by (1), (α/λ²)/(α/λ) = _________ _________ _____ _____ __________ __________ ___ ________ ___ ___ _________.
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Let X be a gamma variable with parameters α and λ, where λ is the rate parameter. For a gamma distribution, the mean and variance are given by E(X) = α/λ and Var(X) = α/λ². Given E(X) = 6 and Var(X) = 3, we have α/λ = 6 …(1) α/λ² = 3 …(2) Dividing (2) by (1), (α/λ²)/(α/λ) = _________ _________ _____ _____ __________ __________ ___ ________ ___ ___ _________.
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