A salesman keeps a record of the number of shops he visits each day. The information is summarized in the following frequency table:
Number of shops Frequency f
visited
0.5 - 0.75 8
7.5 - 14.5 23
14.5 - 21.5 30
21.5 - 28.5 42
28.5 - 35.5 10
35.5 - 42.5 7

Suppose you want to determine the mean number of shops that the salesman visited per day. The statement that is NOT correct, is
[1] The salesman visited a total of 120 shops.
6
[2] The value of sumlimits Σ fixi=2468,00.
(i-1)
[3] The midpoint, x, of the interval 21,5-28,5 shops is x4=25 shops.
[4] The interval width is seven days.