Free Practice Question
PS · Problem Solving
sub-505
Probability
In a bag filled with red, blue, yellow, and green marbles, the chance of selecting a blue marble is 0.25, the chance of selecting a red marble is 0.35, and the chance of selecting a yellow marble is 0.15. What is the probability of selecting a green marble?
Answer Choices
Correct answer marked belowA
0.15
0.25
Correct
C
0.35
D
0.45
E
0.55
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Explanation
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Official Explanation
Official
The total probability of drawing a marble of any color is 1. Therefore, we have: 1 = P(r) + P(g) + P(y) + P(b). Substituting the known probabilities, we get: 1 = 0.25 +…
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Comments
1
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D
DrumilJun 2, 2024
Great question!
What this question tests
What it tests
Your ability to compute probabilities of single and compound events, including 'at least one' questions.
Common trap
Forgetting to use the complement for 'at least one', or treating dependent events as independent.
Details
Difficulty
sub-505
Type
PS
Category