[問題]gamma distribution
As part of a grand opening promotion, a department store has advertised that
every 1000th purchase made on opening day will be given to the customer for
free. The store expects 5 purchases to be made every minute. Let X be the
time (in minutes) from opening until the first free purchase is given away.
Ans: X ~ Gamma(a, l) with a=1000 and l=5. (An alternative answer that is
acceptable is Exponential(l) with l=1/(1000/5)=1/200.)
答案
X ~ Gamma(a, l) with a=1000 and l=5
是以1人0.2分鐘來看
請問若我以5人為一單位
那麼X~Gamma(200,1)
但為什麼不行呢？
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