ISEE Lower Level Math : Probability

Study concepts, example questions & explanations for ISEE Lower Level Math

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Example Questions

Example Question #91 : Probability

A bag has  red marbles,  green marbles, and  blue marbles. What is the probability of NOT drawing a red marble on the first draw?

Possible Answers:

Correct answer:

Explanation:

Recall that a probability is the likelihood of something occurring.

Mathematically, we can write probability as the following:

For this question, we do not want a red marble. This means that we are trying to find the probability of drawing either a blue or a green marble. Since we have  blue marbles and  green marbles, we have  wanted outcomes. Since there is a total of  marbles, we have a total of  possible outcomes.

The probability then becomes the following:

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