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Suppose the grade on a Math test is normally distributed with mean 78 and standard deviation...

Suppose the grade on a Math test is normally distributed with mean 78 and standard deviation 10.

(c) Rob achieved a grade that exceeded 95% of all grades. Find Rob’s actual grade.

(d) Suppose 32% of students did better than Mei. Find Mei’s actual grade.

Please explain why z=-1.65 for C and why z=.47 for D

Math   Statistics-And-Probability   
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