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

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1. The speed of cars passing through a checkpoint follows a normal distribution with m = 62.6 miles per hour and σ = 3.7 miles per hour. What is the probability that the next car passing will … a. Be exceeding 65.5 miles per hour? b. Be exceeding 58.1 miles per hour? c. Be between 61 and 70 miles per hour?
2. The selling price of various homes in a community follows the normal distribution with m = $176,000 and σ = $22,300. What is the probability that the next house will sell for … a. Less than $190,000? b. Less than $158,000? c. Between $150,000 and $168,000?
3. The age of customers for a particular retail store follows a normal distribution with m = 37.5 years and σ = 7.6 years. What is the probability that the next customer ...

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