Question

A study found that the mean amount of time cars spent in drive-throughs of a certain fast-food restaurant was 150.9 seconds. Assuming drive-through times are normal distributed with a standard deviation of 25 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 116 seconds? 

The probability that a randomly selected car will get through the restaurant's drive-through in less than 110 seconds is (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 restaurant's drive-through? 

The probability that a randomly selected car wil spend more than 188 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)

Answer 1