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24 July, 22:15

A group of 625 students has a mean age of 15.8 years with a standard deviation of 0.6 years. The ages are normally distributed. How many students are younger than 16.2 years? Express answer to the nearest student.

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  1. 24 July, 22:35
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    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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