11. Morris rarely arrives home before 4:00 pm. It is now 3:20 pm. Estimate the probability that Morris will arrive home in the next 30 minutes. Working Backward with Probabilities - E Suppose that you are given this information about rolling a number cube. = = = P(1) P(3) P(5) Can you tell what numbers are marked on the faces of the cube? Work backward. Since a cube has six faces, express each probability as a fraction whose denominator is 6. = = = P(1) P(3) P(5) So, the cube must have three faces marked with the number 1, two faces marked 3, and one face marked 5. Each set of probabilities is associated with rolling a number cube. What numbers are marked on the of each cube? 1. = 2. = 3. or 2) = P(2) P(1) P(1 = = or 3) = P(4) P(4) P(2 = of 4) = 1 2, or 3) = 1 P(6) P(factor P(1, Each set of probabilities is associated with the spinner shown at the right. How many sections of each color are there? 4. = 5. or purple) = P(red) P(yellow = or white) = P(blue) P(purple = or blue) = 0 P(green) P(green = purple, or white) = 1 P(black) P(yellow, 6. Suppose that you are given this information about pulling a marble out of a bag.
11. Morris rarely arrives home before 4:00 pm. It is now 3:20 pm. Estimate the probability that Morris will arrive home in the next 30 minutes. Working Backward with Probabilities - E Suppose that you are given this information about rolling a number cube. P(1) = P(3) = P(5) = Can you tell what numbers are marked on the faces of the cube? Work backward. Since a cube has six faces, express each probability as a fraction whose denominator is 6. P(1) = P(3) = P(5) = So, the cube must have three faces marked with the number 1, two faces marked 3, and one face marked 5. Each set of probabilities is associated with rolling a number cube. What numbers are marked on the of each cube? 1. P(2) = 2. P(1) = 3. P(1 or 2) = P(4) = P(4) = P(2 or 3) = P(6) = P(factor of 4) = 1 P(1, 2, or 3) = 1 Each set of probabilities is associated with the spinner shown at the right. How many sections of each color are there? 4. P(red) = 5. P(yellow or purple) = P(blue) = P(purple or white) = P(green) = P(green or blue) = 0 P(black) = P(yellow, purple, or white) = 1 6. Suppose that you are given this information about pulling a marble out of a bag.
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