=+18. Grocery Sales. The owner of a small grocery store thinks that, on average, his daily sales are the same during the weekdays. He keeps track of his daily sales for several months and discovers that sales average $502 on Mondays, $550 on Tuesdays, $495 on Wednesdays, $521 on Thursdays, and $530 on Fridays. He wonders if this evidence contradicts his belief in a uniform distribution of sales across the days of the week. Can we use a chi-square goodness-of-fit test to check the owner’s claim? Explain.