# statistics

posted by .

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 -

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.

## Similar Questions

1. ### statistics

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.
2. ### statistics

A score that is 10 points below the mean corresponds to a z-score of z=-2.00. What is the population standard deviation?
3. ### Math

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.
4. ### statistics

In a population of exam scores, a score of X = 48 corresponds to z = +1.00 and a score of X = 36 corresponds to z = -0.50. Find the mean and standard deviation of the population.
5. ### Statistics

IQ test scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the x- score that corresponds to a z-score of 2.33.
6. ### statistics

In a population of exam scores,a score of X= 48 corresponds to z= 1 and a score of X= 36 corresponds to z= -.50. Find the mean and standard deviation for the population?
7. ### statistics

A score that is 6 points below the mean corresponds to a z-score of z= - .50, what is the population standard deviation?
8. ### stats

2. A standardized exam was provided to all 3rd graders in Arizona schools. The average score was 75 with a standard deviation of 10. Assuming that the scores were normally distributed, answer the following questions. (a) What z-score …
9. ### statistic

In a population of exam scores, a score of X  48 corresponds to z1.00 and a score of X  36 corresponds to z  –0.50. Find the mean and standard deviation for the population. (Hint: Sketch the distribution and locate the two scores …
10. ### Math

Distribution of exam 2 scores is unimodal and symmetric with a mean of 78 and a standard deviation of 4.6 points. What exam score corresponds to z- score of -2.46

More Similar Questions