a. Find E (x) and interpret its value. E (X) = (Type an integer or a decimal. Do not round.) Interpret the value of E (x) . Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round.) A. If many random samples of 96 transformers are taken, then the mean of the sample variances is sags per week. O B. If many random samples of 96 transformers are taken, then the mean of the sample mean numbers of says per week is O C. If many random samples of 96 transformers are taken, then the mean of the sample standard deviations is sags per week. O D. For any random sample of 96 transformers, the mean number of sags per week is always b. Find Var (x) . Var () = (Type an integer or a decimal. Round to three decimal places as needed.) c. Describe the shape of the sampling distribution of x. The sampling distribution of x with mean - = and standard deviation o; = (Type integers or decimals, Rc d. How likely is it to observe a is approximately uniformly distributed ceeds 3707 The probability of such a samp is approximately distributed as x2 (Type an integer or a decimal. Is approximately normally distributedd. How likely is it to observe a sample mean number of sags per week that exceeds 370? The probability of such a sample mean isAccording to a study of the power quality [sags and swells} of a transformer. for transformers built for heavy industry. the distribution of the number of sags per week has a mean of 351 with a standard deviation of T2. Oi interest is it, the sample mean number of sags per week for a random sample of 215 transformers. Complete parts a through d below