From a barrel of colored marbles, you randomly select 3 blue, 2 yellow, 7 red, 8 green, and 2 purple marbles. Find the experimental probability of randomly selecting either a green or a purple marble.
There are 8 green and 2 purple marbles, so the total number of favorable outcomes is 8 + 2 = 10.
The total number of marbles is 3 + 2 + 7 + 8 + 2 = 22.
Therefore, the experimental probability of randomly selecting either a green or a purple marble is 10/22 or 5/11, which is approximately 0.45 or 45%.