Question

A study found that the mean amount of time cars spent in drive-throughs of a certain fast-food resturant was 146.5 seconds. Assuming drive-through times are normally distributed with a standard deviation of 33 seconds.

A.) What is the probability that a randomly selected car will get through the restaurant's drive-through in less than 102 seconds? _______ (Round to four decimal places as needed).

B.) What is the probability that a randomly selected car will spend more than 188 seconds in the resaurant's drive-through? _____ (Round to four decimal places as needed).

C.) What proportion of cars spend between 2 and 3 minutes in the restaurant's drive-through? ____ (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 unusal, since the probability is ___ than 0.05

(Round to four decimal places as needed).

Answer 1