=+67. Used cars. A business student is searching for a used car to purchase, so she posts an ad to a website saying she wants to buy a used Jeep between $18,000 and $20,000.

From Kelly’s BlueBook.com, she learns that there are 149 cars matching that description within a 30-mile radius of her home. If we assume that those are the people who will call her and that they are equally likely to call her:

Price

$18,000–$18,999 $19,000–$19,999 Total Car Make Commander 3 6 9 Compass 6 1 7 Grand Cherokee 33 33 66 Liberty 17 6 23 Wrangler 33 11 44 Total 92 57 149