When a production process is operating correctly, the number of units produced per hour a normal distribution with a mean of 103 and a standard deviation of 15. A random sample of 9 hours was taken. Complete parts (a) through a. Find the mean of the sampling distribution of the sample means. E(X) = (Type an integer or a decimal.) b. Find the variance of the sample mean. = (Type an integer or a decimal.) c. Find the standard error of the sample mean.

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