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The average score on a particular exam is determined to be 84.35 with a standard deviation of 7.4. Assume the scores are normally distributed. Applicants with exam scores in the lower 10% directed to special retraining.
What is the minimum score required not to be directed to retraining?

  • statistics -

    You want the highest 90%.

    Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion. Use that Z score in the above equation. (Remember that the Z score will be negative.)

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