A bag has 3 red, 5 blue and 2 green marbles. One marble is picked at random. What is the probability that it is red?
Answer and explanation
Correct answer: A. 3/10
- Step 1: There are 10 marbles and 3 are red. Step 2. P(red) = 3/10. Answer: 3/10. Why not the others: 1/2: this is the chance of blue. 3/7: this compares red with the other marbles instead of the total. 4/5: this is the chance of red or blue.
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