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Suppose that the class marks on your last history test were normally distributed with a mean...

Suppose that the class marks on your last history test were normally distributed with a mean grade of 70 points and a standard deviation of 8 points. Using table Z answer the questions below. Show your work where requested.

1. What percentage of students got grades less than 50? Show your work.

2. What percentage of students got grades more than 50?

3. What percentage of students are more than 1.5 standard deviations from the mean?

4. What percentage of students have grades within 1.5 standard deviations of the mean?

Math   Statistics-And-Probability   
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