Posted by **devon** on Friday, November 14, 2008 at 10:40pm.

A class of 43 students took an exam. Their mean grade average is 67 and standard deviation is 7.

a) how many students should get a C?

b) how many should get a B?

c) what score is necessary to get an A?

- math -
**Reiny**, Friday, November 14, 2008 at 10:53pm
Here is an excellent applet that will do these kind of questions.

http://davidmlane.com/hyperstat/z_table.html

Unless I know what is considered a C in your country or region, I can't finish the problem for you

enter the mean, the standard deviation, then choose the "between" option

Enter the low end and the high end of your letter grade range.

- math -
**Reiny**, Friday, November 14, 2008 at 10:55pm
(pushed the post button too early)

the result you get will be a decimal between 0 and 1, the probability.

multiply that by the number of students, the 43

## Answer This Question

## Related Questions

- math - For a class of 43 students fora certain exam, the mean grade is 67 and ...
- math - A class of 43 students took an exam. They had a mean average of 67 and a ...
- statistics - In one history class, 34 students took an exam. The mean of the ...
- math - For a class of 43 students, for a certain test, the mean grade is 67 and ...
- Algebra - Over 350 students took a college calculus final exam. the scores of ...
- statistics - Suppose that the mean score of an exam was 77 when taken 30 ...
- statistics - Suppose that the mean score of an exam was 77 when taken 30 ...
- statistics - the average of final exam is 64, the standard deviation is 7. If ...
- stats - Relatively speaking, which statistics exam did you do better on? On ...
- statistics - 1. I took a sample of the grade point averages for students in my ...

More Related Questions