Homework Help: Quantitative methods

Posted by lisa on Thursday, April 7, 2011 at 11:10am.

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?

statistics - PsyDAG, Saturday, April 9, 2011 at 12:52pm
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.
Quantitative methods - Anonymous, Sunday, April 10, 2011 at 7:22am
thanks.

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