The chess club at a school has 15 members. The number of games won in tournament play this season by each member is listed. What measure is most appropriate for describing variability or spread in this data distribution?

You just purchased two coins at a price of $670 each. because one of the coins is more collectible, you believe that its value will increase at a rate of 7.1 percent per year, while you believe the second coin will only increase at 6.5 percent per year. if you are correct, how much more will the first coin be worth in 15 years?