The New Mexico State Highway Department is charged with maintaining all state roads in good condition

The New Mexico State Highway Department is charged with maintaining all state roads in good condition. One measure of condition is the number of cracks present in each 100 feet of roadway. From the department’s yearly sample, the following data were obtained:

4	7	8	9	9	10	11	12	12	13
13	13	13	14	14	14	15	15	16	16
16	16	16	17	17	17	18	18	19	19

Calculate the interfractile ranges between the 20th, 40th, 60th, and 80th percentiles.

Solution

The data are in table

Problems: Measures of Central Tendency and Dispersion in Frequency Distributions

Problem-01: Measures of Central Tendency and Dispersion in Frequency Distributions

The frequency distribution below represents the weights in pounds of a sample of packages carried la...

Problem-02: Measures of Central Tendency and Dispersion in Frequency Distributions

Davis Furniture Company has a revolving credit agreement with the fast National Bank. The loan showe...

Problem-03: Measures of Central Tendency and Dispersion in Frequency Distributions

Child-Care Community Nursery is eligible for a county social services grant as long as the average a...

Problem-04: Measures of Central Tendency and Dispersion in Frequency Distributions

Child-Care Community Nursery can continue to be supported by the county social services office as lo...

Problem-05: Measures of Central Tendency and Dispersion in Frequency Distributions

These data represent the ages patients admitted to a small hospital on February 28, 1996. Constru...

Problem-06: Measures of Central Tendency and Dispersion in Frequency Distributions

The Frequency distributions below represents the time in seconds needed to serve a sample of custome...

Problem-07: Measures of Central Tendency and Dispersion in Frequency Distributions

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Problem-08: Measures of Central Tendency and Dispersion in Frequency Distributions

A Cosmetics manufacturer recently purchased a machine to fill 3-ounce cologne bottles. To test the a...

Problem-09: Measures of Central Tendency and Dispersion in Frequency Distributions

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Problem-10: Measures of Central Tendency and Dispersion in Frequency Distributions

National Tire Company holds reserve funds in short-term marketable securities. The ending daily bala...

Problem-11: Measures of Central Tendency and Dispersion in Frequency Distributions

M. T. Smith travels the eastern United States as a sales representative for a textbook publisher. Sh...

Problem-12: Measures of Central Tendency and Dispersion in Frequency Distributions

Lillian Tyson has been the chairperson of the country library committee for 10 years. She contends t...

Problem-13: Measures of Central Tendency and Dispersion in Frequency Distributions

Dave’s Giveaway Store advertises, “If our average prices are not equal or lower than everyone else’s...

Problem-14: Measures of Central Tendency and Dispersion in Frequency Distributions

Bennett Distributions Company, a subsidiary of a major appliance manufacture, is forecasting regiona...

Problem-15: Measures of Central Tendency and Dispersion in Frequency Distributions

A professor has decided to use a weighted average in figuring final grades for this seminar students...

Problem-16: Measures of Central Tendency and Dispersion in Frequency Distributions

Problem-17: Measures of Central Tendency and Dispersion in Frequency Distributions

Keyes Home Furnishings ran six local newspaper advertisements during December.

Problem-18: Measures of Central Tendency and Dispersion in Frequency Distributions

The Nelson Window Company has manufacturing plants in five U.S. cities Orlando, Minneapolis, Dallas,...

Problem-19: Measures of Central Tendency and Dispersion in Frequency Distributions

The U.S. Postal Services handles seven basic types of letters and cards: third class, second class, ...

Problem-20: Measures of Central Tendency and Dispersion in Frequency Distributions

Matthews, Young and Associates, a management consulting firm, has four types of professionals on its...

Problem-21: Measures of Central Tendency and Dispersion in Frequency Distributions

The Growth in bad-debt expense for Johnston Office Supply Company over the last few follows. Calcula...

Problem-22: Measures of Central Tendency and Dispersion in Frequency Distributions

Realistic Stereo Shops market up its merchandise 35 percent above the cost of its latest additions t...

Problem-23: Measures of Central Tendency and Dispersion in Frequency Distributions

Hayes Textiles has shown the following percentage increase in net worth over the last 5 years.

Problem-24: Measures of Central Tendency and Dispersion in Frequency Distributions

Micro swift, the U.S.- based computer software giant, has posted an increase in net worth during 7 o...

Problem-25: Measures of Central Tendency and Dispersion in Frequency Distributions

The Birch Company, a manufacturer of electrical circuit boards, has manufactured the following numbe...

Problem-26: Measures of Central Tendency and Dispersion in Frequency Distributions

Bob Headen is calculating the average growth factor for this stereo store over the last 6 years. Usi...

Problem-27: Measures of Central Tendency and Dispersion in Frequency Distributions

Over a 3 week period, a store owner purchased $120 worth of acrylic sheeting for new display cases i...

Problem-28: Measures of Central Tendency and Dispersion in Frequency Distributions

Problem-29: Measures of Central Tendency and Dispersion in Frequency Distributions

Industrial Suppliers, Inc., Keeps records on the cost of processing a purchase order. Over the last ...

Problem-30: Measures of Central Tendency and Dispersion in Frequency Distributions

A sociologist has been studying the yearly changes in the number of convicts assigned to the largest...

Problem-31: Measures of Central Tendency and Dispersion in Frequency Distributions

Swifty Markets compares prices charged for identical items in all its food stores. Here are the pric...

Problem-32: Measures of Central Tendency and Dispersion in Frequency Distributions

For the following frequency distributions, determine

Problem-33: Measures of Central Tendency and Dispersion in Frequency Distributions

Meridian Trucking maintains mileage records on all of its rolling equipment. Here are weekly mileage...

Problem-34: Measures of Central Tendency and Dispersion in Frequency Distributions

The North Carolina Consumers Bureau has conducted a survey of cable television providers in the stat...

Problem-35: Measures of Central Tendency and Dispersion in Frequency Distributions

For the following frequency distributions,

Problem-36: Measures of Central Tendency and Dispersion in Frequency Distributions

The following data represent weights of gamefish caught on the charter boat Slickdrifter:

Problem-37: Measures of Central Tendency and Dispersion in Frequency Distributions

Problem-38: Measures of Central Tendency and Dispersion in Frequency Distributions

Problem-39: Measures of Central Tendency and Dispersion in Frequency Distributions

If insurance claims for automobile accidents follow the distributions given, determine the median us...

Problem-40: Measures of Central Tendency and Dispersion in Frequency Distributions

A researcher obtained the following answers to a statement on an evaluation survey: strongly disagre...

Problem-41: Measures of Central Tendency and Dispersion in Frequency Distributions

Here are the ages in years of the cars worked on by the Village Autohaus last week:

Problem-42: Measures of Central Tendency and Dispersion in Frequency Distributions

The ages of a sample of the students attending Sandhills Community College this semester are:

Problem-43: Measures of Central Tendency and Dispersion in Frequency Distributions

A librarian polled 20 different people as they left the library and asked them how many books they c...

Problem-44: Measures of Central Tendency and Dispersion in Frequency Distributions

The ages of residents of Twin Lakes Retirement Village have this frequency distribution: ClassFrequ...

Problem-45: Measures of Central Tendency and Dispersion in Frequency Distributions

What are the modal values for the following distributions?

Problem-46: Measures of Central Tendency and Dispersion in Frequency Distributions

The numbers of apartments in 27 apartment complexes in Cary, North Carolina, are given below.

Problem-47: Measures of Central Tendency and Dispersion in Frequency Distributions

Estimate the mode for the distribution given are given below

Problem-48: Measures of Central Tendency and Dispersion in Frequency Distributions

The number of solar heating systems available to the public is quite large and their heat-storage ca...

Problem-49: Measures of Central Tendency and Dispersion in Frequency Distributions

Ed Grant is the director of the Student Financial Aid Office at Wilderness College. He has used avai...

Problem-50: Measures of Central Tendency and Dispersion in Frequency Distributions

Here are student scores on a history quiz. Find the 80th percentile.

Problem-51: Measures of Central Tendency and Dispersion in Frequency Distributions

The Casual Life Insurance Company is considering purchasing a new fleet of company cars. The financi...

Problem-52: Measures of Central Tendency and Dispersion in Frequency Distributions

For the following data, compute the interquartile range.

Problem-53: Measures of Central Tendency and Dispersion in Frequency Distributions

For the sample that follows, compute the.

Problem-54: Measures of Central Tendency and Dispersion in Frequency Distributions

Here are the high temperature readings during June 1995 in Phonix, arizona. Find the 70th percentile...

Problem-55: Measures of Central Tendency and Dispersion in Frequency Distributions

These are the total fares (in dollars) collected Tuesday by the 20 taxis belonging to City Transit, ...

Problem-56: Measures of Central Tendency and Dispersion in Frequency Distributions

Redi-Mix Incorporated kept the following record of time (to the nearest 100th of a minute) its truck...

Problem-57: Measures of Central Tendency and Dispersion in Frequency Distributions

Warlington Appliances has developed a new combination blender-crock-pot. In a marketing demonstratio...

Problem-58: Measures of Central Tendency and Dispersion in Frequency Distributions

MacroSwift has decided to develop a new software program designed for CEOs and other high-level exec...

Problem-59: Measures of Central Tendency and Dispersion in Frequency Distributions

The New Mexico State Highway Department is charged with maintaining all state roads in good conditio...

Measures of Central Tendency and Dispersion in Frequency Distributions

Problem-59: Measures of Central Tendency and Dispersion in Frequency Distributions

Solution

Problems: Measures of Central Tendency and Dispersion in Frequency Distributions

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