D Question 18 4 pts Solve the problem. Suppose that replacement times for washing machines are normally distributed with a mean of 9.3 years and a standard deviation of 1.1 years. Find the probability that 70 randomly selected washing machines will have a mean replacement time less than 9.1 years. O 0.4357 O 0.4286 0.0643 O 0.0714 D Question 19 4 ptsD Question 19 4 pts Solve the problem. Round to the nearest tenth unless indicated otherwise. The serum cholesterol levels for men in one age group are normally distributed with a mean of 178.2 and a standard deviation of 40.8. All units are in mg/100 mL. Find the two levels that separate the top 9% and the bottom 9%. 161.5 mg/100mL and 194.9 mg/100mL 107.2 mg/100mL and 249.2 mg/100mL 165.1 mg/100mL and 191.26 mg/100mL 123.5 mg/100mL and 232.9 mg/100mL Question 20 4 ptsD Question 20 4 pts Find the number of standard deviations from the mean. Round your answer to two decimal places. Mario's weekly poker winnings have a mean of $344 and a standard deviation of $51. Last week he won $178. How many standard deviations from the mean is that? 1.63 standard deviations above the mean 3.25 standard deviations above the mean 3.25 standard deviations below the mean 1.63 standard deviations below the meanQuestion 21 4 pts Determine which score corresponds to the higher relative position. Which score has a higher relative position, a score of 327.6 on a test for which x = 280 and s = 28, or a score of 22.2 on a test for which x = 20 and s = 2? O A score of 327.6 O Both scores have the same relative position. O A score of 22.2 4 pts