Asked by lisa

the mean and standard deviation of the grades of 500 students who took an maths exam were 69 and 7 respectively. if the grades have a bell shaped distribution, how many of these students received a grade of more than 83 marks?

14 years ago

Answered by PsyDAG

Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to this Z score. Multiply it by 500.

14 years ago

Answered by Anonymous

thanks.

14 years ago

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