Answered: The Bell company manufactures laptop…

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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The Bell company manufactures laptop computers. A study indicates that the life spans of their
computers are normally distributed, with a mean of 4.0 years and a standard deviation of 1.2 years.
How long should the company warrant its computers if the company wishes less than 4% of its
computers to fail during the warranty period?

A professor finds that the grades in a large class are normally distributed. The mean of the grades is
64, and the standard deviation is 10. If the professor decides to give an A grade to the students in the
top 9% of the class, what is the cut-off score for an A?

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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