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Mathematical Statistics with Applications | 7th Edition | ISBN: 9780495110811 | Authors: Dennis Wackerly; William Mendenhall; Richard L. Scheaffer
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The fracture strength of tempered glass averages 14

Chapter 7, Problem 42E

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QUESTION:

Problem 42E

The fracture strength of tempered glass averages 14 (measured in thousands of pounds per square inch) and has standard deviation 2.

a What is the probability that the average fracture strength of 100 randomly selected pieces of this glass exceeds 14.5?

b Find an interval that includes, with probability 0.95, the average fracture strength of 100 randomly selected pieces of this glass.

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QUESTION:

Problem 42E

The fracture strength of tempered glass averages 14 (measured in thousands of pounds per square inch) and has standard deviation 2.

a What is the probability that the average fracture strength of 100 randomly selected pieces of this glass exceeds 14.5?

b Find an interval that includes, with probability 0.95, the average fracture strength of 100 randomly selected pieces of this glass.

ANSWER:

Step 1 of 3

Given that

The fracture strength of tempered glass averages 14 and has standard deviation 2.

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