Interval	Frequency
35-39	5
40-44	3
45-49	8
50-54	3
55-59	7
60-64	3
65-69	1
70-74	2

Using the grouped frequency distribution table, add to the existing table by adding a column for the cumulative frequency and a column for the cumulative percentage. Display the two added tables.

Find two percentages not already listed on the table (such as 40% or 50%). Please show the math and how you reached these two percentages that you have chosen.

Explain how knowing the percentages of data can help you better understand the variable or data.