Problem-Solving and Data AnalysisEasySimple probability
Problem-Solving and Data Analysis practice question
A bag contains 3 red marbles and 5 blue marbles. If one marble is chosen at random, what is the probability that it is red?
- A. 3/8Correct
- B. 3/5
- C. 5/8
- D. 1/3
Answer: A. 3/8
Probability is favourable outcomes over total outcomes. There are 3 red marbles out of 3 + 5 = 8 marbles in all, so the probability is 3/8.
Why the other answers are wrong
- B. 3/5
- 3/5 compares red with blue. The denominator must be ALL the marbles, 3 + 5 = 8.
- C. 5/8
- 5/8 is the probability of choosing a BLUE marble. The question asks for red.
- D. 1/3
- 1/3 comes from putting the 3 red marbles in the denominator. The denominator is the total number of marbles, 8.
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