Answer
A: see below for the cumulative frequency table:
B:70% of the songs are under 4 minutes.
Work Step by Step
A.Cumulative frequency is the total frequency of a given class and prior classes in a table:
Time 0-1:20: 0=0
Time 1:21-2:41 :2+0=2
Time 2:42-4.02 :5+2+0=7
The 4:03-5.23: 3+5+2+0=10
B.7 out of the 10 songs are under 4 minutes. Divide 7 and 10 to find the percent of songs under 4 minutes.7/10=0.7=70%. There are 70% of songs which are under 4 minutes.
