Probability Review

Use the spinner to answer the questions. 1. What is the probability that you will land on a red wedge? 2. What is the probability that you will land on a green or yellow wedge? 3. What is the probability that you will land on a wedge that has a color with the letter “e” in the name? 5/12 1/12 12/12 or 1

4. Samantha goes to a party and has to select an ice cream cone from the following options. There are 2 types of cones (sugar and waffle). There are four types of ice cream (chocolate, vanilla, strawberry, and mint.) Draw a tree diagram to show all of the possible combinations can be made.

5. The table shows the meal choices in the cafeteria today. How many combinations of meals can you make if you choose one item from each category? There are 18 combinations.

6. The table below shows the features for a computer. You choose one keyboard, one monitor, and one printer. How many different choices can you make? KeyboardMousePrinter StandardColor 15 in.Inkjet ExtendedColor 17 in.Color Inkjet AdjustableColor 19 in.Laser 27: using the counting method (3 x 3 x 3)

7. Of 28 students in a class, 7 are five years old. What is P(five years old) and P(not five years old)? P(five years old) = 1/4 P(not five years old) = 3/4

8. What is the probability that your name is selected at random from a list of 6 names in decimal form? 1/6 = 0.16

9. A spinner has equal-sized sections numbered 1 through 20. You spin the spinner once. What is the probability, written as a decimal, that you spin a multiple of 5? 4/20 or 1/5 = 0.2

10. If even, the Player A wins. Otherwise, Player B wins. Outcome # of Times Rolled The table below shows the results of tossing a chipped number cube 80 times. Tell whether each game seems fair. Tell why or why not. 11. If 1, 2, or 3, then Player A wins. Otherwise, Player B wins. No; the experimental probability of rolling an even number is 27/80 Yes: the experimental probability of rolling a 1, 2, or 3 is 1/2.

12. A teacher asks 70 random students, “Did you see the electricity exhibit.?” Fourteen answer yes. If 1,000 students went on the trip, how many likely saw the exhibit? 200 students

13. Suppose you take a sample of 15 pieces of bubble gum, and a sample of 60 pieces of gum from one days production. Which sample is more likely to give you a closer prediction? Explain why. The larger sample (60 pieces) because experimental probability is more accurate with more trials.

14. A pencil is dropped 20 times. It points left 8 times. Find the experimental probability that the pencil points left. 8/20 or 2/5

15. Park rangers are planning programs at a national park. They conduct a survey of 200 families at the park. The results are in the table below. 6,552 Reason for VisitNumber of Families Camping84 Hiking72 Fishing44 The total number of families visiting the park each summer is 15,600. Predict the number of families that will come to the park for each activity in the table. 5,616 3,432