Question

As reported by a recent​ survey, the​ fast-food restaurant with the best​ drive-through time had a mean time spent in the​ drive-through of mu equals 63.6 seconds. Assuming​ drive-through times are normally distributed with sigma equals 2.9 ​seconds, complete parts ​(a) through ​(d) below. ​(a) What is the probability that a randomly selected car will get through the​ drive-through in less than 60.3 ​seconds? The probability is nothing. ​(Round to four decimal places as​ needed.) ​(b) What is the probability that a randomly selected car will spend more than 70.3 seconds in the​ drive-through? The probability is nothing. ​(Round to four decimal places as​ needed.) ​(c) What proportion of cars spend between 60.3 and 70.3 seconds in the​ drive-through? nothing ​(Round to four decimal places as​ needed.) ​(d) Would it be unusual for a car to spend more than 70.3 seconds in the​ drive-through?

Answer 1

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