Virginia Suboleski is an aircraft maintenance supervisor. A recent delivery of bolts from a new supplier caught the eye of a clerk. Suboleski sent 25 of the bolts to a testing lab to determine the force necessary to break each of the bolts. In thousands of pounds of force, the results are as follows:
The telephone system used by PHM, a mail-order company, keeps track of how many customers tried to call the toll-free ordering line but could not get through because all the firm’s lines were busy. This number, called the phone overflow rate, is expressed as a percentage of the total number of calls taken in a given week. Mrs. Loy has used the overflow data for the last year to prepare the following frequency distribution:
Hanna Equipment Co. sells process equipment to agricultural companies in developing countries. A recent office fire burned two staff members and destroyed most of Hanna’s business records. Karl Slayden has just been hired to help rebuild the company. He has found sales records for the last 2 months
Jeanne Moreno is analyzing the waiting times for cars passing through a large expressway toll plaza that is severely clogged and accident-prone in the morning. Information was collected on the number of minutes that 3,000 consecutive drivers waited in line at the toll gates:
Maribor Cement Company of Montevideo, Uruguay, hired Delbert Olsen, an American manufacturing consultant, to help design and install various production reporting systems for its concrete roof tile factory. For example, today Maribor made 7,000 tiles and had a breakage rate during production of 2 percent. To measure daily tile output and breakage rate, Olsen has set up equally spaced classes for each. The class marks (midpoints of the class intervals) for daily tile output are 4,900, 5,500, 6,100, 6,700, 7,300, and 7,900. The class marks for breakage rates are 0.70, 2.10, 3.50, 4.90, 6.30, and 7.70.
BMT, Inc., manufactures performance equipment for cars used in various types of racing. It has gathered the following information on the number of models of engines in different size categories used in the racing market it serves
A business group is supporting the addition of a light-rail shuttle in the central business district and has two competing bids with different numbers of seats in each car. They arrange a fact-finding trip to Denver, and in a meeting they are given the following frequency distribution of number of passengers per car:
Jeanne Moreno’s employer, the state Department of Transportation, recently worked with a nearby complex of steel mills, with 5,000 employees, to modify the complex’s shift changeover schedule so that shift changes do not coincide with the morning rush hour. Moreno wants an initial comparison to see whether waiting times at the toll plaza appear to have dropped. Here are the waiting times observed for 3,000 consecutive drivers after the mill schedule change