Assume a data set is normally distributed with mean 19 and standard deviation 2.5

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Assume a data set is normally distributed with mean 19 and standard deviation 2.5. If the data set contains 50 data values, approximately how many of the data values will fall within the range 16.5 to 21.5? 

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    Assume a data set is normally distributed with mean 19 and standard deviation 2.5
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