A health food store has launched a new pack of vitamins for children. The store records the number of packs ordered by a random sample of 100 online customers and the number of packs ordered by a random sample of 100 walk-in customers. Two dot plots are shown one below the other. The title for the top dot plot is Online Customers and the title for the bottom plot is Walk In Customers. Below the line for each dot plot is written Number of Packs. There are markings from 1 to 5 on each line at intervals of one. For the top line there are 0, 0, 1, 4, 5 dots respectively for marks from 1 to 5. For the bottom line there are 3, 6, 1, 0, 0 dots respectively for marks from 1 to 5. On the right side, towards the middle of the two plots is shown a dot symbol equal to 10 customers.

Which of the following inferences can be drawn about the buying pattern of the online customers versus that of the walk-in customers? SHOW YOUR WORK. (5 points)

a
Online customers buy an average of about five packs compared with walk-in customers, who buy an average of about three packs.

b
Online customers buy an average of five packs compared with walk-in customers, who buy an average of two packs.

c
Online customers buy an average of six-packs compared with walk-in customers, who buy an average of three packs.

d
Online customers buy an average of six-packs compared with walk-in customers, who buy an average of two packs.