# math

posted by .

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 -

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 -

(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

## Similar Questions

1. ### math

For a class of 43 students, for a certain test, the mean grade is 67 and the standard deviation is 7. a) how many students should receive a C?
2. ### math

For a class of 43 students fora certain exam, the mean grade is 67 and the standard deviation is 7. a) How many students should receive a C?
3. ### math

A class of 43 students took an exam. They had a mean average of 67 and a standard deviation of 7. a) how many students got a c b) how many students got a b c) what is a scoree needed to get an a is a) 4 b) 1 c) 90
4. ### Statistics

Students were given an exam with 300 multiple-choice questions. The distribution of the scores was normal and mean was 195 with a standard deviation of 30. What were the scores of the students who were within one standard deviation …
5. ### math

The mean score on a Math exam was 50% and the standard deviation was 10%. Assume the results were normally distributed. (a) What percent of students earned a score between 50% and 70%?
6. ### algebra

students in a biology class just took a final exam. a formula for predicting the average exam grade on a similar test t months later is. s(t)=78-15log(t+1) (a)find the students average score when they first took the final exam. (b)what …
7. ### statistics

In one history class, 34 students took an exam. The mean of the exam was 52 with a standard deviation of 13. If the instructor is going to assume data are normally distributed and assign grades on a curve, then she will assign an A …
8. ### statistics

Suppose that the mean score of an exam was 77 when taken 30 students took it on time with a standard deviation of 2. A makeup of the same exam is given to 6 students. The retakes averaged a score of 83 with a standard deviation of …
9. ### statistics

Suppose that the mean score of an exam was 77 when taken 30 students took it on time with a standard deviation of 2. A makeup of the same exam is given to 6 students. The retakes averaged a score of 83 with a standard deviation of …
10. ### math

Statistics: Analyze student exam scores Students were given an exam with 300 multiple choice questions. The distribution of the scores were normal and the mean was 195 with a standard deviation of 30. you may find it helpful to draw …

More Similar Questions