Use the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 65 miles per hour, with a standard deviation of 5 miles per hour. Estimate the percent of vehicles whose speeds are between 55 miles per hour and 75 miles per hour. (Assume the data set has a bell-shaped distribution.)
Use the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 65 miles per hour, with a standard deviation of 5 miles per hour. Estimate the percent of vehicles whose speeds are between 55 miles per hour and 75 miles per hour. (Assume the data set has a bell-shaped distribution.)
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section: Chapter Questions
Problem 22SGR
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Question
Use the Empirical Rule . The mean speed of a sample of vehicles along a stretch of highway is
65
miles per hour, with a standard deviation of
5
miles per hour. Estimate the percent of vehicles whose speeds are between
55
miles per hour and
75
miles per hour. (Assume the data set has a bell-shaped distribution.)Expert Solution
Step 1
Given that
X~N( μ = 65 , ? = 5 )
μ = 55 , ? = 5
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