statistics

Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15.

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  1. What is your question?

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  2. Yes, it would be unusal for the mean of a sample of 3 to be 115 or more because there is only a 4.18% chance for this to happen.

    P(X >= 115)
    = P(X >= (115 - 100) / sqrt(15^2 / 3))
    = P(X >= 1.732050808)
    = 0.0418

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