You select a marble without looking and then put it back. If you do this 10 times, what is the best prediction possible for the number of times you will pick a green marble?

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?