Probability d. What proportion of the samples will have a mean useful life between 36.5 and 38.5 hours? Probability
Probability d. What proportion of the samples will have a mean useful life between 36.5 and 38.5 hours? Probability
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
please solve only d part
Transcribed Image Text:Power +, Inc. produces AA batteries used in remote-controlled toy cars. The mean
life of these batteries follows a normal distribution with a mean of 37 hours and a
standard deviation of 5.5 hours. As a part of its quality assurance program, Power
+, Inc. tests samples of 9 batteries.
а.
What can you say about the shape of the distribution of the sample mean?
Sample (Click to
mean
select) Normal Uniform Binomial
Round answers to four decimal places.
b. What proportion of the samples will have a mean useful life of more than 38.5
hours?
Probability
What is the probability that a randomly selected AA battery will have a useful
life of at most 36.5 hours?
с.
Probability
d.
What proportion of the samples will have a mean useful life between 36.5 and
38.5 hours?
Probability
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