on average 4speeding cases per day were recorded at cross what is the probability that exactly 5 s cases were recorded in any given day?
回答 (1)
2015-11-25 9:47 am
We use poisson distribution, with its probability formula:
e^(-x)*x^n/(n!), where x is the expected no. of occurence in a time interval, and n is the desired no. of occurence.
So the probability is e^(-4)*4^5/(5!) = 0.1563
e^(-x)*x^n/(n!), where x is the expected no. of occurence in a time interval, and n is the desired no. of occurence.
So the probability is e^(-4)*4^5/(5!) = 0.1563
收錄日期: 2021-04-24 10:35:22
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