A normally distributed random variable Y possesses a mean of

A normally distributed random variable Y possesses a mean of mu equals 20 and a standard deviation of sigma equals 5. A random sample of n equals 31 observations is to be selected. Let X be the sample average. ( X in this problem is really x) Describe the sampling distribution of X(i.e. describe the distribution of X and give U-x sigma equals n) Find the z-score of x=22 Find P(X-greter than 22) A restaurants receipts show that the cost of customers\' dinners has a distribution will speed a total of a least 55800 on dinner?

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