A population has a mean of 90 and a standard deviation of 7. If it is sampled repeatedly with samples of size 144, a) what is the mean and standard deviation of the sample means? (Round to 4 decimal places) b) What is the probability the sample mean is greater than 90.87? (Round to 4 decimal places) c) What is the probability the sample mean is less than 92.16? (Round to 4 decimal places)

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