Here are the shopping times (in minutes) of nine shoppers at a local grocery store. Complete the grouped frequency distribution for the data.
In the distribution, the frequency of a class is the number of shopping times in that class.
(Note that we are using a class width of 6.)
Shopping time
(in minutes)
Frequency
Х
Shopping time
(in minutes)
15 to 20
5
?
28
23
22
21 to 26
25
16
19
27 to 32
28
21
15