if a bag has one red marble 2 blue marbles and 1 green marble what is the theoretical probability of picking a blue marble?

There are 4 marbles.

2 marbles are blue

P(blue) = 2/4

To find the theoretical probability of picking a blue marble, we need to divide the number of favorable outcomes (blue marbles) by the number of possible outcomes (total marbles).

In this case, the number of blue marbles is 2, and the total number of marbles is 1 (red) + 2 (blue) + 1 (green) = 4.

So, the theoretical probability of picking a blue marble is:

Number of blue marbles / Total number of marbles = 2 / 4

Simplifying the fraction, we get:

2/4 = 1/2

Therefore, the theoretical probability of picking a blue marble is 1/2 or 50%.