A parking control ofcer is conducting an analysis of the amount of time left on parking meters. A quick survey of 150 cars that have just left their metered parking spaces produced the following times (in minutes): 22, 15, 20. Given the following calculations: 22+15+' - '+20=6000 and 222+152+m+202=800000 A 90% confidence interval of the amount of time left on the parking meters is closest to 40:11.64 40:10.22 40: 8.234 40: 3.31 Daily sales in a store follows approximately a normal distribution with mean $500 and standard deviation $200. Assume daily sales are independent from clay to day. In the next 4 days, the probability that their average daily sales exceed $600 is closest to 0.1915 0.3085 ' 0.445 0.3413 ' 0.1587