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A population has a mean of 400 and a standard deviation of 90. Suppose a sample of size 100 is selected and is used to

A population has a mean of 400 and a standard deviation of 90. Suppose a sample of size 100 is selected and image text in transcribed is used to estimate . Use z-table.

a. What is the probability that the sample mean will be within +-5 of the population mean (to 4 decimals)?

b. What is the probability that the sample mean will be within +-18 of the population mean (to 4 decimals)?

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