The time to complete a task is a random variable X that follows a normal distribution with mean u and standard deviation of 10 minutes. Given that P(X > 10) = 0.7389. If 300 observations are taken at random from this distribution, the number of observations greater than 22 is closest to ' 130 86 " 100 121 112 A parking control ofcer is conducting an analysis of the amount of time left on parking meters. A quick survey of 15 cars that have just left their metered parking spaces produced the following times (in minutes): 22, 15, 20. Given the following calculations: 22+15+~~+2o=600 and 222+152+m+202=80000 Assume that the amount of time left follows approximately a normal distribution. A 90% condence interval of the amount of time left on the parking meters is closest to 40:11.64 40:28.757 40: 9.77 " 40:12.32