(Score for Question 4: of 4 points) 4. A clerk at a pet store kept track of customers who purchased at least one box of animal treats in one week. The following histogram shows how many boxes of treats customers purchased throughout the week. (a) How many customers purchased animal treats that week? (1 point) (b) Based on the labelled intervals, what is the maximum number of boxes that could have been purchased? (1 point) (c) How many customers purchased fewer than 11 boxes of animal treats during the week? (1 point) (d) From the information on the histogram, could you answer the following question: How many customers purchased 1 box of dog treats? (1 point)