If a bag contains 4 red marbles, 5 blue marbles, and 3 green marbles, what is the probability of drawing a blue marble at random?
Answer and explanation
Correct answer: B. 5/12
- Step 1: Calculate the total number of marbles: 4 + 5 + 3 = 12 marbles.
- Step 2: Count the favorable blue marbles: 5.
- Step 3: Probability = 5 / 12.
Answer
5/12.
Why not the others: Option 1/3 (4/12) is the probability of drawing a red marble. Option 1/4 (3/12) is the probability of drawing a green marble. Option 5/7 divides blue marbles by non-blue marbles (odds, not probability).
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