If a fair six-sided die is rolled once, what is the probability of rolling a 4?

There are 6 possible outcomes when rolling a fair six-sided die (1, 2, 3, 4, 5, and 6), and only 1 of those outcomes is a 4.

Therefore, the probability of rolling a 4 on a fair six-sided die is 1/6 or approximately 0.1667.

In a bag containing 5 blue marbles, 3 green marbles, and 2 red marbles, what is the probability of randomly picking a green marble? Write answer as fraction in simplest form.