Question

you have a bag with 20 marbles 2 yellow 5 green 12 red and 1 blue which of the following statements are true? Select all that apply. a) The probability of choosing a yellow, green, red, or blue marble is 1 b) The probability of choosing a yellow marble is less than the probability of choosing a blue marble c) The probability of choosing a green marble is 0.25 d) The probability of choosing a black marble is zero

Answer 1

1. An event has probability 1 if you're certain that it will happen. You are sure to pick a marble that's either yellow, green, red, or blue. So, this probability is 1.
2. There are more yellow marbles than blue marbles, so it's actually more likely that you'll pick a yellow one, rather than the blue one.
3. The probability of picking a green marble is given by the number of green marbles divided by the total number of marbles. Compute this ratio and see what you get.
4. Similarly, the probability of picking a black marble is given by the number of black marbles divided by the total number of marbles. There are no black marbles, so...