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For a normal population with a mean equal to 78 and a standard deviation equal to 17 , determine the probability of observing a sample

For a normal population with a mean equal to 78 and a standard deviation equal to 17 , determine the probability of observing a sample mean of 83 or less from a sample of size 8.

P(x<=83).......(the answer for this question is 0.973)

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