The test scores are normally distributed with a mean of 78 and astandard deviation of 9. If 39 scores are randomly selected, find theprobability that the average score is between 80 and 84.

Obtain the probability that the average score is between 80 and 84. The probability that the average…

Answered: The test scores are normally…

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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Americans spend an average 12.2 minutes in the shower. If the standard deviation of the variable is 2 minutes and the variable is normally distributed, find the probability that the mean time of a sample of 15 Americans who shower will be less than 12 minutes.
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The average score of this quiz is 24 points with a standard deviation of 1.5 points. What is the probability that someone scored 21.9 or less? Write your answer as a percentage without rounding.
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The test scores are normally distributed with a mean of 78 and a standard deviation of 9. If 39 scores are randomly selected, find the probability that the average score is between 80 and 84.