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Math Help - Normal Curve Probability...

  1. #1
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    Normal Curve Probability...

    "A population is normally distributed with a mean of 25.8 and a standard deviation of 1.5. What is the probability that a randomly selected member of the population will have a measure greater than 28?"


    And yet there are NO examples of this in the book nor in the online course.

    Help?
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by MathIsRelativelyUseless View Post
    "A population is normally distributed with a mean of 25.8 and a standard deviation of 1.5. What is the probability that a randomly selected member of the population will have a measure greater than 28?"


    And yet there are NO examples of this in the book nor in the online course.

    Help?
    Compute the z-score of 28 : z=\frac{28-25.8}{1.5}=1.467

    Now look this up in a table of the cumulative standard normal to find: P(z\le 1.467), and you want P(z > 1.467)=1-P(z \le 1.467)

    RonL
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  3. #3
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    Ah, thank you sir.
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