Statistics

Question

The scores for math test #3 were normally distributed. If 15 students had a mean score of 74.8% and a standard deviation of 7.57, how many students scored above an 85%?

tutormaster · Answer

With a mean of .748 and a stddev of .0757 you would use a zscore table or calculator to get the answer. Using this calculator
http://davidmlane.com/hyperstat/z_table.html
and setting the appropratie inputs and with above = 0.85, you would see that you would expect about 0.0889 to get above a 85%. Rounding down to the nearest student that would be 1 student.

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