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Mathematics 14 Online
OpenStudy (anonymous):

A biology class did a survey of an open field for the number of visible insects per square foot of ground. The results were normally distributed. The mean was 28 insects and the standard deviation was 5. Suppose the class surveyed 50 one-foot square plots. Find the number of plots that contained a number of insects within one standard deviation of the mean ?

OpenStudy (anonymous):

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