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Sta 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. es ome The sampling distribution of x is normal with u- = 158.00 and o; = 2.1213 ork (Round to four decimal places as needed.) (c) What is the probability that a random sample of 18 pregnancies has a mean gestation period of 155 days or less? & Tests The probability that the mean of a random sample of 18 pregnancies is less than 155 days is approximately 0.0793 Activity (Round to four decimal places as needed.) ok Interpret this probability. Select the correct choice below and fill in the answer box within your choice. Plan (Round to the nearest integer as needed.) O A. If 100 independent random samples of size n = 18 pregnancies were obtained from this population, we would expect sample(s) to have a sample mean of book exactly 155 days. B. If 100 independent random samples of size n = 18 pregnancies were obtained from this population, we would expect 8 sample(s) to have a sample mean of unch 155. days or less. ter Conten O C. If 100 independent random samples of size n = 18 pregnancies were obtained from this population, we would expect sample(s) to have a sample mean of Incorrect: 0 155 days or more. (d) What is the probability that a random sample of 64 pregnancies has a mean gestation period of 155 days or less? 14) s for Succes The probability that the mean of a random sample of 64 pregnancies is less than 155 days is approximately (Round to four decimal places as needed.) timedia Lib chase Option Help me solve this View an example Get more help Clear all Check