A clothing item is purchased for a seasonal sale. It costs $35, but it has a sale price of $50. After the season is over, it is marked down by 50% to clear the merchandise. The estimated quantities to be sold are:
no of items(n) 10 15 20 25 30 35
probability of selling exactly n items 0.15 0.20 0.30 0.20 0.10 0.05