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When a production process is operating correctly, the number of units produced per hour has a normal distribution with a mean of 104 and a standard deviation of 8. A random sample of 16 hours was taken. Complete parts (a) through (d). a. Find the mean of the sampling distribution of the sample means. E (X) = 104 (Type an integer or a decimal.) b. Find the variance of the sample mean. 6= = 4 (Type an integer or a decimal.) c. Find the standard error of the sample mean. ox = 2 (Type an integer or a decimal.) d. What is the probability that the sample mean exceeds 105.4? P(X > 105.4) = (Round to four decimal places as needed.)