Online marketplaces such as Craigslist have become a popular way for individuals to buy and sell miscellaneous items. The table below shows the numbers of days products stayed active (not sold) on one of these sites and also the price range of the items.

Days on the Website Price Range 1- 7 8 - 30 Over 30 Under $200 125 15 30

$200–$500 200 150 100

$501–$1,000 400 525 175 Over $1,000 125 140 35

a. Using the relative frequency approach to probability assessment, what is the probability that a product will be on the website more than 7 days?

b. Is the event 1-7 days on the website independent of the price $200–$500?

c. Suppose an item has just sold and was on the website less than 8 days, what is the most likely price range for that item?