18 (1 point) Saved Question 18 options: Airlines operate under the assumption that, on average, 10% of individuals who make flight reservations will not appear for their scheduled flights. This is modeled by considering each person independently, with a 10% probability of not showing up. As a result, the airline's practice is to sell 100 tickets for a flight that has a capacity for only 94 passengers. Using the central limit theorem, determine 95% confidence interval estimation for the number of people who show up. (enter to two decimal places) Lower Confidence Level (LCI) = 84.12 Upper Confidence Interval (UCI) = 95.88 Question 19 (1 point) The average grade on MGSC 660 is 75%. The "A" grade cutoff is 85%. Assume that we know the standard deviation of grades is 5%. Using normal distribution, calculate the fraction of students who get an "A"? (enter to two decimal places) Question 19 options: Question 20 (1 point) At the Montreal Casino, with each game, there is a 20% chance of earning a 500 dollar and a 80% chance of losing a 100 dollar. Let X represent the total money won or lost after 100 games, where the result could be either positive or negative. Using central limit theorem, calculate the probability of X>=0. (enter to three decimal places)