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20. The lifetimes of refrigerators are normally distributed, and it turns out that a refrigerator that lasts 17 years corresponds to z = 1.20. Note that you're not being told the mean and standard deviation because the z-score is given to you right there, so you can skip that step. Use the standard normal distribution chart to answer these questions. a) If you buy a refrigerator randomly, what is the probability that it will last 17 years or fewer? b) What is the probability that a random refrigerator will last 17 years or more? c) There are 150 million refrigerators in the U.S. How many are expected to last 17 years or more?

20. The lifetimes of refrigerators are normally distributed, and it turns out that a refrigerator that lasts 17 years corresponds to z = 1.20. Note that you're not being told the mean and standard deviation because the z-score is given to you right there, so you can skip that step. Use the standard normal distribution chart to answer these questions. a) If you buy a refrigerator randomly, what is the probability that it will last 17 years or fewer? b) What is the probability that a random refrigerator will last 17 years or more? c) There are 150 million refrigerators in the U.S. How many are expected to last 17 years or more?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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20. The lifetimes of refrigerators are normally distributed, and it turns out that a refrigerator that lasts 17 years corresponds to z = 1.20. Note that you're not being told the mean and standard deviation because the z-score is given to you right there, so you can skip that step. Use the standard normal distribution chart to answer these questions. a) If you buy a refrigerator randomly, what is the probability that it will last 17 years or fewer? b) What is the probability that a random refrigerator will last 17 years or more? c) There are 150 million refrigerators in the U.S. How many are expected to last 17 years or more?
Transcribed Image Text:20. The lifetimes of refrigerators are normally distributed, and it turns out that a refrigerator that lasts 17 years corresponds to z = 1.20. Note that you're not being told the mean and standard deviation because the z-score is given to you right there, so you can skip that step. Use the standard normal distribution chart to answer these questions. a) If you buy a refrigerator randomly, what is the probability that it will last 17 years or fewer? b) What is the probability that a random refrigerator will last 17 years or more? c) There are 150 million refrigerators in the U.S. How many are expected to last 17 years or more?
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