A sample of 20 production workers in a small company earned the following wages for a given week, rounded to the nearest dollar and arranged in ascending order: $240, 240, 240, 240, 240, 240, 240,...

A sample of 20 production workers in a small company earned the following wages for a given week, rounded to the nearest dollar and arranged in ascending order: $240, 240, 240, 240, 240, 240, 240, 240, 255, 255, 265, 265, 280, 280, 290, 300, 305, 325, 330, 340. Determine the (a) range and (b) middle 80 percent range for this sample.