Answered: A survey was conducted to measure the…

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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A survey was conducted to measure the number of hours adults spend sleeping each week. In the survey, the number of hours was normally distributed, with an average of 7 hours and a standard deviation of 1 hour. One adult was chosen at random. Which of the alternatives below corresponds to the probability that this participant will spend more than 10 hours a week sleeping?

a) 0,9987%

b) 13%

c) 99,87%

d) 0,13%

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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