Computer World Ltd keeps records of the length of time it takes to repair a faulty computer. The company’s records show that repair times may be assumed to be normally distributed with a mean of 40 hours and a standard deviation of 5.54 hrs. Find the probability that the repair time is more than 35 hours.

Computer World Ltd keeps records of the length of time it takes to repair a faulty computer. The company’s records show that repair times may be assumed to be normally distributed with a mean of 40 hours and a standard deviation of 5.54 hrs. Find the probability that the repair time is more than 35 hours.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.4: Distributions Of Data

Problem 19PFA

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Question

1. Computer World Ltd keeps records of the length of time it takes to repair a faulty computer. The company’s records show that repair times may be assumed to be normally distributed with a mean of 40 hours and a standard deviation of 5.54 hrs. Find the probability that the repair time is more than 35 hours.

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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