The Casual Life Insurance Company is considering purchasing a new fleet of company cars. The financial department's director. tom Dawkins, sampled 40 employees to determine the number of miles each drove over a 1-year period. The results of the study follow. Calculate the range and interquartile range.
Read more: Problem-51: Measures of Central Tendency and Dispersion in Frequency Distributions
For the following data, compute the interquartile range.
Read more: Problem-52: 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..
Read more: Problem-54: 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, Ltd.
Read more: Problem-55: 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 waited at the job to unload. Calculate the range and the interquartile range.
Read more: Problem-56: Measures of Central Tendency and Dispersion in Frequency Distributions
Warlington Appliances has developed a new combination blender-crock-pot. In a marketing demonstration, a price survey determined that most of those sampled would be willing to pay around $60, with a surprisingly small interquartile range of $14.00. In an attempt to replicate the results, the demonstration and accompanying survey were repeated. The marketing department hoped to find an even smaller interquartile range. The data follow. Was its hope realized?
| 52 | 35 | 48 | 46 | 43 | 40 | 61 | 49 | 57 | 58 | 65 | 46 |
| 72 | 69 | 38 | 37 | 55 | 52 | 50 | 31 | 41 | 60 | 45 | 41 |
| 55 | 38 | 51 | 49 | 46 | 43 | 64 | 52 | 60 | 61 | 68 | 49 |
| 69 | 66 | 35 | 34 | 52 | 49 | 47 | 28 | 38 | 57 | 42 | 38 |
Read more: Problem-57: 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 executives. MacroSwift did not want to develop a program that required too much hard-drive space, so they polled 36 executives to determine the amount of available space on their PCs. The results are given below in megabytes.
| 6.3 | 6.7 | 7.9 | 8.4 | 9.7 | 10.6 | 12.4 | 19.4 | 29.1 | 42.6 |
| 59.8 | 97.6 | 100.4 | 120.6 | 135.5 | 148.6 | 178.6 | 200.1 | 229.6 | 284.6 |
| 305.6 | 315.6 | 325.9 | 347.5 | 358.6 | 397.8 | 405.6 | 415.9 | 427.8 | 428.6 |
| 439.5 | 440.9 | 472.3 | 475.9 | 477.2 | 502.6 |
Calculate the range and interquartile range.
Read more: Problem-58: Measures of Central Tendency and Dispersion in Frequency Distributions
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.
Read more: Problem-59: Measures of Central Tendency and Dispersion in Frequency Distributions
Minhajur Rahaman
