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a group of 625 students has a mean age of 15.8 years with a standard deviation of 1.2 years. the ages are normally distributed. about how many students in this sample are younger than 17?

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Answer: 16.2-15.8/0.6=0.6667. Use normalcdf() to find the percentage from -999 to 0.6777 which is 0.7476*625=467

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