A highway study of 8000 vehicles that passed by a checkpoint found that their speeds were normally distributed with a mean of 61 mph and a standard deviation of 7 mph. a. How many of the vehicles had a speed of more than 63 mph. b. How many of the vehicles had a speed of less than 40 mph.

A highway study of 8000 vehicles that passed by a checkpoint found that their speeds were normally distributed with a mean of 61 mph and a standard deviation of 7 mph. a. How many of the vehicles had a speed of more than 63 mph. b. How many of the vehicles had a speed of less than 40 mph.

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

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.5: Comparing Sets Of Data

Problem 1GP

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Question

A highway study of 8000 vehicles that passed by a checkpoint found that their speeds were normally distributed with a mean of 61 mph and a standard deviation of 7 mph.

a. How many of the vehicles had a speed of more than 63 mph.

b. How many of the vehicles had a speed of less than 40 mph.

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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