Calculate the variance of the number of boxes of chocolates that the florist sells on any given day.

A small local florist that is open 7 days a week specialises in bouquets made from home-grown flowers and gourmet home-made chocolates. As they are a small business, the florist is aware that on any given day, they do not sell large quantities of either bouquets or chocolates. Based on past experience, the florist believes that, on any given day, the relationship between the number of bouquets they sell (Y) and the number of boxes of chocolates they sell (X) is described by thejoint probability distribution below. The florist is also certain that sales of either bouquets or chocolates are independent from day to day. Bouquets (y) 4 5 8 10 2 0.17 0.05 0.01 0.08 Chocolates (a3) 4 0.13 0.09 0.02 0.15 5 0.12 0.03 0.07 0.08