The number of e-mails a friend received each day during the last 20 days is shown below. What number of days did she receive 19 or fewer e-mails in a day?
Emails
Frequency
Cumulative Frequency
0 to 9 4 4
10 to 19
7 11
20 to 29
4 15
30 to 39
4 19
40 to 49
1 20
(1 point)
Responses
7
7
11
11
12
12
15