This quiz: 9 point(s) possible Co = Quiz: Quiz 7.1 - 7.3 Question 4 of 9 This question: 1 point(s) possible Submit quiz A study found that the mean amount of time cars spent in drive-throughs of a certain fast-food restaurant was 137 6 seconds Assuming drive-through times are normally distributed with a standard deviation of 28 seconds, complete parts (a) through (d) below. (a) What is the probability that a randomly selected car will get through the restaurant's drive through in less than 99 seconds? The probability that a randomly selected car will get through the restaurant's drive-through in less than 99 seconds is (Round to four decimal places as needed ) (b) What is the probability that a randomly selected car will spend more than 187 seconds in the restaurant's drive-through? The probability that a randomly selected car will spend more than 187 seconds in the restaurant's drive-through is (Round to four decimal places as needed ) (c) What proportion of cars spend between 2 and 3 minutes in the restaurant's drive-through? The proportion of cars that spend between 2 and 3 minutes in the restaurant's drive-through is (Round to four decimal places as needed) (d) Would it be unusual for a car to spend more than 3 minutes in the restaurant's drive-through? Why? The probability that a car spends more than 3 minutes in the restaurant's drive-through is . so it be unusual, since the probability is than 0 05 (Round to four decimal places as needed ) Next 10:23 AM S 25/03/2022 D re 9