QUE Sigma xbar 2: " Suppose that a normal population has a standard deviation of 18.05. If a sample of size 21 were taken, what would be the value of the standard deviation of the sampling distribution of the sample mean? Round to three decimal places QUESTION 19 2 points Save Answer CH7 z 2: A normally distributed population has a mean of 98.57 and a standard deviation of 0.343. What is the z-score of the sample average98.63 from samples of size 93? (round to nearest hundredth) QUESTION 20 2 points Save Answer CH7 Z 4: A normally distributed population has a mean of 1.16 and a standard deviation of 0.17. What is the z-score of the sample average 1.21 from samples of size 25? (round to nearest hundredth) QUESTION 21 2 points Save Answer Click Save and Submit to save and submit. Click Save All Answers to save all answers