Posted by **Jen** on Friday, September 25, 2009 at 10:29am.

In a population of exam scores, a score of X=88 corresponds to z= +2.00 and a score of X=79 corresponds to

z= -1.00. Find the mean and standard deviation for the population.

- statistics -
**PsyDAG**, Friday, September 25, 2009 at 11:44am
Mean is 2 SD below 88 and one above 79.

88 - 79 = 9 Therefore mean is 1/3 of that distance above 79 and 2/3 below 88.

Z = (x - μ)/SD

Substitute the values for Z, x and μ, and solve for the SD.

I hope this helps. Thanks for asking.

## Answer this Question

## Related Questions

- statistics - In a population of exam scores,a score of X= 48 corresponds to z= 1...
- statistics - In a population of exam scores, a score of X = 48 corresponds to z...
- statistics - In a population of exam scores, a score of x=88 corresponds to z=+2...
- Math - In a population of exam scores, a score of X=88 corresponds to z= +2.00 ...
- statistic - In a population of exam scores, a score of X 48 corresponds to z...
- stats - 2. A standardized exam was provided to all 3rd graders in Arizona ...
- statistics - A score that is 6 points below the mean corresponds to a z-score of...
- statistics - A score that is 10 points below the mean corresponds to a z-score ...
- Math - Distribution of exam 2 scores is unimodal and symmetric with a mean of 78...
- Statistics - IQ test scores are normally distributed with a mean of 100 and a ...

More Related Questions