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Probability
Math
Middle School Math

 Name _____________________________ Date ___________________
Probability
Complete.

 1 Ms. Crump always includes a few bonus questions on her tests. Since if you get them wrong they don't count against your score, you might as well try them. However, on the last test she said you were only allowed to answer three of the five bonus questions offered. How many combinations of three questions could have been selected from the five bonus questions?
 2 Mr. Bloop has discovered a new species of cactus in Bolivia. He goes to the location where they are found on the side of a mountain. He sees many specimens of the new species growing there. He collects some data on the color of the flowers produced by this cactus. He finds that forty-five of the plants have purple flowers and thirty-five have white flowers. Now, assuming that the flower color ratio is the same everywhere in Bolivia for this plant, if he goes to another mountain side and collects similar data, what is the probability that the first plant he comes across will have white flowers? Write your answer as a percent rounded to the nearest tenth.
 3 Joseph and Eric go to the mall parking lot on weekends to see if they can find any loose change. People tend to lose small amounts of money in the parking lot. Over the past year they have kept track of how much money they have found. They found twenty quarters, two fifty-cent pieces, twenty-five dimes, twenty-four nickels, and two hundred seven pennies. What is the probability that the next coin they find will be worth more than ten cents? State your answer as a percent to the nearest percent.
 4 Jonathan lives in Montana. On a bus trip across the state he looks out the window and sees where other vehicles are from. On the trip he sees 175 vehicles with Montana plates and 40 with non-Montana plates. On the trip back the next day, what is the probability that the first car he sees is from Montana?
 5 Kaitlyn shows her friend Grace a deck of cards. Assuming the cards in the deck are randomly distributed, what is the probability that Kaitlyn draws an ace and does not replace it, and then draws another ace?
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