Question

The following is a frequency data set for test scores in a small class. Construct a cumulative frequency plot displaying the data on your own paper, calculator, or StatCrunch. Then, describe the the graph in a sentence or two. Be sure to communicate in your answer how to create the graph (be sure to include what the cumulative frequencies are) Test scores:

40-49 : 1
50-59 : 2
60-69 : 2
70-79 : 7
80-89 : 9
90-99 : 5

Answer 1

The cumulative frequency table is shown below. The value of cumulative frequency is the sum of all previous frequencies. We should have 26 at the end of the table because all frequency add up to 26

To graph the cumulative frequency, we would need the plots.

Use the end of value range against the cumulative frequency value
Range 40-49, use the value 49 against the cumulative frequency 1

(49, 1)
(59, 3)
(69, 5)
(79, 12)
(89, 21)
(99, 26)

Plot these on graph and connect them as a curve