statistics

posted by .

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.

  • statistics -

    The difference between the 48 and the 36 is 1.5 standard deviations. Thus
    1.5 sigma = 12,
    and sigma (the standard deviation) = 8

    48 is one sigma above the mean, so the mean is 40.

Respond to this Question

First Name
School Subject
Your Answer

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=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.
  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 z1.00 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