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The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

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Your Turn

1. The number of rainy days per month at a particular town follows a Poisson distribution with a mean value of six days. What is the probability that it will rain four days next month?
2. The number of customers arriving at a particular store follows a Poisson distribution with a mean value of 7.5 customers per hour. What is the probability that five customers will arrive during the next hour?
3. The number of pieces of mail that I receive daily follows a Poisson distribution with a mean value of 4.2 per day. What is the probability that I will receive more than two pieces of mail tomorrow?
4. The number of employees who call in sick on Monday follows a Poisson distribution with a mean value of 3.6. What is the probability that ...

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