. The marketing manager of a food delivery service provider wants to investigate the monthly expenditure of customers during the recent promotion. The total amounts of expenditure in the last month [corrected to the nearest dollars} of randoml},F selected customers are summa- rized as follows. Expenditure ($} Frequency Below 1,000 12 1,000 below 1,500 22 1,500 below 2,000 35 2,000 below 2,500 2? 2,500 below 3,000 10 3,000 below 5,000 3 (c) Estimate, from the frequency distribution table, the proportion of customers who spend between $1,800 and $2,800 on food delivery in the last month. (d) Discount coupons will be given to the customers whose amount of expenditure is among top 30% of all customers in the last month. Estimate, from the frequency distribu- tion table, the minimum amount of expenditure of the customers who receive discount coupons