poisson distribution
2011-04-03 6:47 pm
Let X~Po(5) and k be a non-negative integer. If P(X >= k ) >0.7, find the greatest value of k.
回答 (1)
2011-04-03 7:31 pm
✔ 最佳答案
P(X = 0) = e^(-5) = 0.006738P(X = 1) = 5e^(-5) = 0.0337
P(X = 2) = 25e^(-5)/2 = 0.0842
P(X = 3) = 125e^(-5)/6 = 0.1404
P(X = 4) = 625e^(-5)/24 = 0.1755
P(X = 5) = 3125e^(-5)/120 = 0.1755
P(X = 6) = (5^6)e^(-5)/720 = 0.1462
P(X <= 3) = 0.265038
So, the greatest value of k is 4
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110403000051KK00313