A jar contains 30 red marbles, 50 blue marbles, and 20 white marbles. You choose one marble from the jar at random. What is the theoretical probability of choosing a blue marble?
The theoretical probability of choosing a blue marble can be calculated by dividing the number of favorable outcomes (blue marbles) by the total number of possible outcomes (all marbles).
The number of blue marbles is 50, and the total number of marbles is 30 (red) + 50 (blue) + 20 (white) = 100.
Therefore, the theoretical probability of choosing a blue marble is 50/100 = 1/2 = 0.5, which can also be expressed as 50%.