Explore BrainMass

Explore BrainMass

    Standard deviation

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    Please use MINITAB to solve or explain how I can use MINITAB to solve.

    7. Assume that the midterm's scores X are normally distributed. Let X have a mean of 72 and a standard deviation of 12. Then answer the following three questions:

    a. What is the probability of obtaining a score at least 90?
    b. What is the probability of obtaining a score at most 75?
    c. What is the probability of obtaining a score between 60 and 79?

    © BrainMass Inc. brainmass.com March 4, 2021, 5:38 pm ad1c9bdddf
    https://brainmass.com/statistics/normal-distribution/standard-deviation-3633

    Solution Preview

    Cumulative Distribution Function
    <br>
    <br>Normal with mean = 72.0000 and standard deviation = 12.0000
    <br>
    <br> x P( X <= x )
    <br> 90.0000 0.9332
    <br>
    <br>SO Prob of at least 90 = 1 - .9332
    <br>
    <br>Cumulative Distribution ...

    $2.49

    ADVERTISEMENT