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Question 320:

Individual scores of a placement examination are normally distributed with a mean of 84.2 and a standard deviation of 12.8.

If the score of an individual is randomly selected, find the probability that the score will be less than 90.0.

If a random sample of size n = 20 is selected, find the probability that the sample mean will be less than 90.0.

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Need help with the concepts in this question ? View the Comparing Two Means: 2 Sample t-test Tutorial.

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