5:02LTE 2.1 4GKA study found that the mean amount of time cars spent in drive-throughs of a certain fast-food restaurant was 137.9seconds. Assuming drive-through times are normally distributed with a standard deviation of 29 seconds, completeparts (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 103seconds?The probability that a randomly selected car will get through the restaurant's drive-through in less than 103 seconds is0.(Round to four decimal places as needed.)(b) What is the probability that a randomly selected car will spend more than 190 seconds in the restaurant's drive-through?38%The probability that a randomly selected car will spend more than 190 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.)(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 itunusual, since the probability is▼than 0.05.(Round tofourdecimalplaces as needed.)|||=Obe

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← A study found that the mean amount of time cars spent in drive-throughs of a certain fast-food restaurant was 137.9 seconds. Assuming drive-through times are normally distributed with a standard deviation of 29 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 103 seconds? The probability that a randomly selected car will get through the restaurant's drive-through in less than 103 seconds is (Round to four decimal places as needed.) (b) What is the probability that a randomly selected car will spend more than 190 seconds in the restaurant's drive- through? The probability that a randomly selected car will spend more than 190 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.) (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, s so it unusual, since the probability is than 0.05. (Round to four decimal places as needed.) be

2nd Edition

ISBN:9780321964038

Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Chapter13: Probability And Calculus

Section13.2: Expected Value And Variance Of Continuous Random Variables

Problem 10E