SO A - C IS DONE I JUST NEED HELP WITH D. I AM PROVIDING THE INFORMATION OF A-C TO JUST HELP WITH D.

Homework:Ch 7Question 21

A study found that the mean amount of time cars spent in drive-throughs of a certain fast-food restaurant was 143.4

seconds. Assuming drive-through times are normally distributed with a standard deviation of 24 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 107

seconds? The probability that a randomly selected car will get through the restaurant's drive-through in less than 107 seconds is 0.0643 (Round to four decimal places as needed.)

(b) What is the probability that a randomly selected car will spend more than 183 seconds in the restaurant's drive-through? The probability that a randomly selected car will spend more than 183 seconds in the restaurant's drive-through is 0.0495

(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 0.7735 (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 (WOULD OR WOULD NOT)

be unusual, since the probability is (GREATER OR LESS) than 0.05. Round to four decimal places as needed