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Normal distribution with mean 56 and standard deviation

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EXERCISES ON SAMPLING DISTRIBUTION OF THE MEAN

Question 1. In a normal distribution with mean 56 and standard deviation 21, how large a sample must be taken so that there will be at least a 90% chance that its mean is greater than 52

Question 2 . In a normal distribution with mean 375 and standard deviation 48, how large a sample must be taken so that the probability will be at least 0.95 that the sample mean falls between 370 and 380?

Reference no: EM132372674

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