- #1
mattclgn
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Homework Statement
Automobile accidents occur in the United States over a 72 hour holiday period like events in a Poisson process with parameter lambda=10/hr. V is the time until the 10th accident
a) what is expected value of V or E[V] and standard deviation?
b) What is the probability that V is larger than 1 hour?
Homework Equations
variance = n/(Lambda^2)
fX(x)={λαxα−1e−λxΓ(α) x>0 otherwise
∫∞0λαxα−1e−λxΓ(α)dx=λαΓ(α)∫∞0xα−1e−λxdx
I'm going to post to Wolfram, as I think I'm doing a terrible job of explaining the above...I hope that is okay http://mathworld.wolfram.com/GammaDistribution.html
The Attempt at a Solution
a)so since variance = n/(Lambda^2) or 10/100, we can take square root to get both
b)...no idea