Problem-Solving and Data Analysis practice question

Answer: A. 1/2

Not green means red or blue: 4 + 6 = 10 of the 20 marbles. Probability = 10/20 = 1/2.

Why the other answers are wrong

B. 1/5

1/5 is the probability of RED only (4/20). 'Not green' includes blue as well.

C. 3/10

3/10 is the probability of BLUE only (6/20).

D. 1/10

1/10 would be 2 marbles out of 20; there are 10 non-green marbles.

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