menu
bartleby
search
close search
Hit Return to see all results
close solutoin list

Automobiles traveling on a road with a posted speed limit of 55 miles per hour are checked for speed by a state police radar system. Following is a frequency distribution of speeds. Speed (miles per hour) Frequency 45–49 10 50–54 40 55–59 150 60–64 175 65–69 75 70–74 15 75–79 10 Total 475 a. What is the mean speed of the automobiles traveling on this road? b. Compute the variance and the standard deviation.

BuyFindarrow_forward

STATISTICS F/BUSINESS+ECONOMICS-TE...

13th Edition
Anderson
Publisher: CENGAGE L
ISBN: 9781305881884

Solutions

Chapter
Section
BuyFindarrow_forward

STATISTICS F/BUSINESS+ECONOMICS-TE...

13th Edition
Anderson
Publisher: CENGAGE L
ISBN: 9781305881884
Chapter 3, Problem 74SE
Textbook Problem
377 views

Automobiles traveling on a road with a posted speed limit of 55 miles per hour are checked for speed by a state police radar system. Following is a frequency distribution of speeds.

Speed (miles per hour) Frequency
45–49 10
50–54 40
55–59 150
60–64 175
65–69 75
70–74 15
75–79 10
  Total 475
  1. a. What is the mean speed of the automobiles traveling on this road?
  2. b. Compute the variance and the standard deviation.

a.

To determine

Find the mean speed of the automobiles travelling on this road.

Explanation of Solution

Calculation:

The formula for the mean is,

x¯=fiMifi

Where fi is the frequency and Mi is the middle value of the interval.

The mean is obtained using the following table:

fiMifiMi
1047

b.

To determine

Find the variance and standard deviation.

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Chapter 3 Solutions

STATISTICS F/BUSINESS+ECONOMICS-TEXT
Show all chapter solutions
add
Ch. 3.1 - According to the National Education Association...Ch. 3.1 - The Big Bang Theory, a situation comedy featuring...Ch. 3.1 - In automobile mileage and gasoline-consumption...Ch. 3.1 - The data contained in the file named StateUnemp...Ch. 3.1 - Martinez Auto Supplies has retail stores located...Ch. 3.1 - The grade point average for college students is...Ch. 3.1 - The following table shows the total return and the...Ch. 3.1 - Based on a survey of masters programs in business...Ch. 3.1 - Annual revenue for Corning Supplies grew by 5.5%...Ch. 3.1 - Suppose that at the beginning of 2004 you invested...Ch. 3.1 - If an asset declines in value from 5000 to 3500...Ch. 3.1 - The current value of a company is 25 million. If...Ch. 3.2 - Consider a sample with data values of 10, 20, 12,...Ch. 3.2 - Consider a sample with data values of 10, 20, 12,...Ch. 3.2 - Consider a sample with data values of 27, 25, 20,...Ch. 3.2 - Data collected by the Oil Price information...Ch. 3.2 - The results of a search to find the least...Ch. 3.2 - The Australian Open is the first of the four grand...Ch. 3.2 - The Los Angeles times regularly reports the air...Ch. 3.2 - The following data were used to construct the...Ch. 3.2 - The results of Accounting Principals latest...Ch. 3.2 - Advertising age annually compiles a list of the...Ch. 3.2 - Scores turned in by an amateur golfer at the...Ch. 3.2 - The following times were recorded by the...Ch. 3.3 - Consider a sample with data values of 10, 20, 12,...Ch. 3.3 - Consider a sample with a mean of 500 and a...Ch. 3.3 - Consider a sample with a mean of 30 and a standard...Ch. 3.3 - Suppose the data have a bell-shaped distribution...Ch. 3.3 - The results of a national survey showed that on...Ch. 3.3 - The energy information Administration reported...Ch. 3.3 - The Graduate Management Admission Test (GMAT) is a...Ch. 3.3 - Many families in California are using backyard...Ch. 3.3 - According to a Los Angeles Times study of more...Ch. 3.3 - A sample of 10 NCAA college basketball game scores...Ch. 3.3 - The Wall Street Journal reported that Walmart...Ch. 3.4 - Consider a sample with data values of 27, 25, 20,...Ch. 3.4 - Show the box plot for the data in exercise 46.Ch. 3.4 - Show the five-number summary and the box plot for...Ch. 3.4 - A data set has a first quartile of 42 and a third...Ch. 3.4 - Naples, Florida, hosts a half-marathon (13.1-mile...Ch. 3.4 - Annual sales, in millions of dollars, for 21...Ch. 3.4 - Consumer Reports provided overall customer...Ch. 3.4 - Fortune magazines list of the worlds most admired...Ch. 3.4 - The Bureau of Transportation Statistics keeps...Ch. 3.5 - Five observations taken for two variables follow....Ch. 3.5 - Five observations taken for two variables follow....Ch. 3.5 - Ten major college football bowl games were played...Ch. 3.5 - A department of transportations study on driving...Ch. 3.5 - Over the past 40 years, the percentage of homes in...Ch. 3.5 - The Russell 1000 is a stock market index...Ch. 3.5 - A random sample of 30 colleges from Kiplingers...Ch. 3 - The average number of times Americans dine out in...Ch. 3 - USA Today reports that NCAA colleges and...Ch. 3 - The average waiting time for a patient at an El...Ch. 3 - U.S. companies lose 63.2 billion per year from...Ch. 3 - A study of smartphone users shows that 68% of...Ch. 3 - Public transportation and the automobile are two...Ch. 3 - In 2007 the New York Times reported that the...Ch. 3 - The data contained in the DATAfile named...Ch. 3 - Travel + Leisure magazine provides an annual list...Ch. 3 - The 32 teams in the National Football League (NFL)...Ch. 3 - Does a major league baseball teams record during...Ch. 3 - The days to maturity for a sample of five money...Ch. 3 - Automobiles traveling on a road with a posted...Ch. 3 - The Panama Railroad Company was established in...Ch. 3 - Pelican Stores Pelican Stores, a division of...Ch. 3 - Motion Picture Industry The motion picture...Ch. 3 - Business Schools of Asia-Pacific The pursuit of a...Ch. 3 - African Elephant Populations Although millions of...

Additional Math Textbook Solutions

Find more solutions based on key concepts
Show solutions add
What is employee fraud?

Accounting Information Systems

Take a look at Hewlett Packards inventory turnover ratio. How does this ratio compare with that of its peers? H...

Fundamentals of Financial Management, Concise Edition (with Thomson ONE - Business School Edition, 1 term (6 months) Printed Access Card) (MindTap Course List)

Are economists for or against regulation?

Economics (MindTap Course List)

Explain the purpose of a research proposal and how it differs from a research report.

Research Methods for the Behavioral Sciences (MindTap Course List)

Prove Theorem 8.5.1

Discrete Mathematics With Applications

True or False: If a function is not increasing on an interval, then it is decreasing on the interval.

Study Guide for Stewart's Single Variable Calculus: Early Transcendentals, 8th

Round all answers to two decimal places unless otherwise indicated. 10. Practicing Calculation For each of the ...

Functions and Change: A Modeling Approach to College Algebra (MindTap Course List)

Will You Incur a Delivery Charge? A furniture store offers free setup and delivery services to all points withi...

Applied Calculus for the Managerial, Life, and Social Sciences: A Brief Approach

15. A test was conducted for two overnight mail delivery services. Two samples of identical deliveries were set...

Modern Business Statistics with Microsoft Office Excel (with XLSTAT Education Edition Printed Access Card) (MindTap Course List)

fill in the blanks. The vector X=c1(11)e9t+c2(53)e7t is a solution of the initial-value problem X=(11063)X,X(0)...

A First Course in Differential Equations with Modeling Applications (MindTap Course List)