40. Wendy's Drive-Through Fast-food restaurants spend quite abit of time studying the amount of time cars spend in their drivethroughs. Certainly, the faster the cars get through the drive-through, the more the opportunity for making money. QSRMagazine studied drive-through times for fast-food restaurantsand found Wendy's had the best time, with a mean time spentin the drive-through of 138.5 seconds. Assuming drive-throughtimes are normally distributed with a standard deviation of29 seconds, answer the following.(a) What is the probability that a randomly sclected car will getthrough Wendy's drive-through in less than 100 scconds?(b) What is the probability that a randomly sclected car will spendmore than 160 seconds in Wendy's drive-through?(e) What proportion of cars spend between 2 and 3 minutes inWendy's drive-through?(d) Would it be unusual for a car to spend more than 3 minutesin Wendy's drive-through? Why?

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d) Would it be unusual for a car to spend more than 3 minutes in Wendy's drive-through? Why?
 
40. Wendy's Drive-Through Fast-food restaurants spend quite a
bit of time studying the amount of time cars spend in their drive
throughs. Certainly, the faster the cars get through the drive-
through, the more the opportunity for making money. QSR
Magazine studied drive-through times for fast-food restaurants
and found Wendy's had the best time, with a mean time spent
in the drive-through of 138.5 seconds. Assuming drive-through
times are normally distributed with a standard deviation of
29 seconds, answer the following.
(a) What is the probability that a randomly sclected car will get
through Wendy's drive-through in less than 100 scconds?
(b) What is the probability that a randomly sclected car will spend
more than 160 seconds in Wendy's drive-through?
(e) What proportion of cars spend between 2 and 3 minutes in
Wendy's drive-through?
(d) Would it be unusual for a car to spend more than 3 minutes
in Wendy's drive-through? Why?
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40. Wendy's Drive-Through Fast-food restaurants spend quite a bit of time studying the amount of time cars spend in their drive throughs. Certainly, the faster the cars get through the drive- through, the more the opportunity for making money. QSR Magazine studied drive-through times for fast-food restaurants and found Wendy's had the best time, with a mean time spent in the drive-through of 138.5 seconds. Assuming drive-through times are normally distributed with a standard deviation of 29 seconds, answer the following. (a) What is the probability that a randomly sclected car will get through Wendy's drive-through in less than 100 scconds? (b) What is the probability that a randomly sclected car will spend more than 160 seconds in Wendy's drive-through? (e) What proportion of cars spend between 2 and 3 minutes in Wendy's drive-through? (d) Would it be unusual for a car to spend more than 3 minutes in Wendy's drive-through? Why?

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Expert Answer

Step 1

It is given that the mean time spent in the Wendy’s drive-through is normally distributed with mean 138.5 seconds and standard deviation is 29 seconds.

Step 2

Probability that a car to spend more than 3 minutes (180 seconds) can be obtained by entering the...

-1-NORM.DIST(180,138.5,29,TRUE)
E
F
G
0.076210166
LL
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-1-NORM.DIST(180,138.5,29,TRUE) E F G 0.076210166 LL

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