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Mathematics 16 Online
OpenStudy (anonymous):

The mean and standard deviation height (in cms) for fifty girls in year 10 at a particular school are 164.3 and 7.49 respectively. The mean height for thirty-six boys is 173.5 cm. If 4 boys of the 36 boys in year 10, are shorter than the mean height for girls find the standard deviation of the boys’ heights. Assume all heights are normally distributed.

OpenStudy (anonymous):

PLZ help i have know idea what to do

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