What portion of the class got an exam grade

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1. Suppose Tea is in a very large class. The final exam grades of Tea's class resemble a Normal distribution with mean 58.4 (out of 100) and variance 9. Tea's exam grade is 62.8. How many standard deviations from the mean is Tea's exam grade?

2. What portion of the class got an exam grade less than or equal to Tea's exam grade? Use the table above to answer this question.

3. What portion of the class got a grade greater than Tea's grade?

4. Tom is in the same class as Tea. His exam grade is 45.2. What is "standardized value" of Tom's exam grade"?

5. What portion of the class got an exam grade greater than Tom's exam grade?

6. If Jerry's exam grade is less than Tea's and it is exactly two standard deviations away from the mean grade, what is Jerry's grade equal to?

Reference no: EM132851911

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