The time (in seconds) needed to complete a critical task on an assembly line was measured for a sample of 50 assemblies.
The date is displayed in the accompanying table.
40.3 41.9 44.4 42.8 41.1 42.2 40.7 46.8 40.5 40.6
44.5 43.1 40.1 40.7 40.9 40.7 40.2 40.6 47.9 41.0
41.1 44.6 40.2 43.1 41.1 42.1 40.6 41.5 40.2 40.3
40.9 40.0 41.6 40.2 44.4 44.2 40.2 40.1 41.4 44.1
43.7 42.7 42.4 42.8 41.0 40.7 43.4 45.7 40.7 40.4
Using the stem and leaf technique, construct a less-than cumulative frequency distribution. -Draw to scale a histogram, frequency polygon and less-than cumulative ogive using the information from 1. Use the ogive to determine the range and the mid80% range. Determine the coefficient of variation. Interpret your answer.