Answered: Watch your speed: Speeds of automobiles…

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

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.1: Measures Of Center

Problem 3AGP

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Watch your speed: Speeds of automobiles on a certain stretch of freeway at :1100 P.M. are normally distributed with mean 70mph. Twenty-five percent of the cars are traveling at speeds between 60 and 70mph. What percentage of the cars are going faster than 80mph?

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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