The following data show the exam grades for two different sections of a statistics class that I teach. The first group of data is from a day section of traditional students. The second group of data is from my evening section, which is comprised mostly of older students who work full time during the day. These data can also be found in the Excel file statistics grades. xlsx. Consider these data as discrete data because fractional grades will not occur.

a. Construct a percentage polygon for these data.
b. Construct a cumulative percentage polygon for these data.
c. What conclusions can be drawn about the grade distribution of these two sections?

Day 71 69 68 90 87 76 90 66 90 71 66 75 78 80 75 90 76 77 80 100 75 75 66 86 85 86 77 75 66 77 Evening 96 98 88 94 88 86 100 99 95 89 96 98 92 85 93 83 90 88 91 89 8782 83 87 88 88 8 93 77 90