Answered: The average lifespan of a CleanFreek…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

The average lifespan of a CleanFreek dishwasher is normally distributed with a mean of 9 years and a standard deviation of 1.8 years.

Standard Normal Distribution Table

a. What is the probability that a CleanFreek dishwasher will last longer than 11 years?
P(X > 11)=

b. What is the probability that a CleanFreek dishwasher will last fewer than 7 years?
P(X < 7)=

c. What length warranty should be established on the dishwashers so that no more than 1.6% of the units will need to be replaced under warranty?
x=

years

Round to 2 decimal places.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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