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& Tests Suppose the lengths of the pregnancies of a certain animal are approximately normally distributed with mean u = 158 days and standard deviation o = 9 days. Complete parts (a) through (f) below. Activity ok . . . lan (a) What is the probability that a randomly selected pregnancy lasts less than 155 days? The probability that a randomly selected pregnancy lasts less than 155 days is approximately 0.3707 . (Round to four decimal places as needed.) bok Interpret this probability. Select the correct choice below and fill in the answer box within your choice. nch (Round to the nearest integer as needed.) O A. If 100 pregnant individuals were selected independently from this population, we would expect pregnancies to last exactly 155 days. Conten B. If 100 pregnant individuals were selected independently from this population, we would expect 37 pregnancies to last less than 155 days. O C. If 100 pregnant individuals were selected independently from this population, we would expect pregnancies to last more than 155 days. r Succes (b) Suppose a random sample of 18 pregnancies is obtained. Describe the sampling distribution of the sample mean length of pregnancies. edia Libr The sampling distribution of x is normal with u- = 158.00 and o; = 2.1213. (Round to four decimal places as needed.) se Option (c) What is the probability that a random sample of 18 pregnancies has a mean gestation period of 155 days or less? sions The probability that the mean of a random sample of 18 pregnancies is less than 155 days is approximately (Round to four decimal places as needed.) Tools