a bag contains 4 white, 3 blues, and 5 red marbles. find the probability of choosing a red marble, if the marbles are replaced.

A) 1/12***
B) 5/36
c) 5/6
D) 5/12

5 marbles out of 12

Prob(red) = 5/12

To find the probability of choosing a red marble, if the marbles are replaced, you need to calculate the ratio of the number of red marbles to the total number of marbles in the bag.

Step 1: Find the total number of marbles in the bag
The bag contains 4 white + 3 blue + 5 red = 12 marbles.

Step 2: Find the number of red marbles
There are 5 red marbles in the bag.

Step 3: Determine the probability of choosing a red marble
The probability is given by the formula: Probability = Number of desired outcomes / Total number of possible outcomes.

In this case, the number of desired outcomes is the number of red marbles, which is 5.
The total number of possible outcomes is the total number of marbles in the bag, which is 12.

Therefore, the probability of choosing a red marble, if the marbles are replaced, is 5/12.

So, the correct answer is option D) 5/12.