Marketing: Coupons Each box of Healthy Crunch breakfast cereal contains a coupon entitling you to a free package of garden seeds. At the Healthy Crunch home offi ce, the weight of incoming mail is used to determine how many employees are to be assigned to collecting coupons and mailing out seed packages on a given day. (Healthy Crunch has a policy of answering all its mail on the day it is received.)

Let x 5 weight of incoming mail and y 5 number of employees required to process the mail in one working day. A random sample of 8 days gave the following data:

x (lb) 11 20 16 6 12 18 23 25 y (Number of employees) 6 10 9 5 8 14 13 16 Complete parts

(a) through (c), given x 5 131; y 5 81; x2 5 2435; y2 5 927; xy 5 1487

(d) If Healthy Crunch receives 15 pounds of mail, how many employees should be assigned mail duty that day?