The tread life of Road Stone tires has a normal distribution with a mean of 35,000 miles and a standard deviation of 4,000 miles. a. What proportion of these tires has a tread life of more than 38,000 miles? b. What proportion of these tires has a tread life of less than 32,000 miles? c. What proportion of these tires has a tread life of between 32,000 and 38,000 miles? d. Draw a graph of the probability density function of tread lives, illustrating why the answers to parts (a) and (b) are the same and why the answers to parts (a), (b), and (c) sum to 1.
The tread life of Road Stone tires has a normal distribution with a mean of 35,000 miles and a standard deviation of 4,000 miles. a. What proportion of these tires has a tread life of more than 38,000 miles? b. What proportion of these tires has a tread life of less than 32,000 miles? c. What proportion of these tires has a tread life of between 32,000 and 38,000 miles? d. Draw a graph of the probability density function of tread lives, illustrating why the answers to parts (a) and (b) are the same and why the answers to parts (a), (b), and (c) sum to 1.
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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The tread life of Road Stone tires has a
a. What proportion of these tires has a tread life of more than 38,000 miles?
b. What proportion of these tires has a tread life of less than 32,000 miles?
c. What proportion of these tires has a tread life of between 32,000 and 38,000 miles?
d. Draw a graph of the probability density
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