red_pe_ch_10.pdf

You randomly choose one shirt from the shelves find

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You randomly choose one shirt from the shelves. Find the probability of the event. 11. Choosing a red shirt 12. Choosing a green shirt 13. Not choosing a white shirt 14. Not choosing a black shirt 15. Choosing an orange shirt 16. ERROR ANALYSIS Describe and correct the error in finding the probability of not choosing a blue shirt from the shelves above. 2 Spinner A Forward Down Forward Up Reverse Up Spinner B Forward Reverse Down Forward Down Up U For U 1 P ( not blue) = 4 10 = 2 5

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Section 10.2 Probability 411 Solve the inequality. Graph the solution. (Section 4.2 and Section 4.3) 23. x + 5 < 9 24. b 2 7 25. 1 > w 3 26. 6 2 g 27. MULTIPLE CHOICE Find the value of x . (Section 7.4) A 85 B 90 C 93 D 102 17. CONTEST The rules of a contest say that there is a 5% chance of winning a prize. Four hundred people enter the contest. Predict how many people will win a prize. 18. RUBBER DUCKS At a carnival, the probability that you choose a winning rubber duck from 25 ducks is 0.24. a. How many are not winning ducks? b. Describe the likelihood of not choosing a winning duck. 19. DODECAHEDRON A dodecahedron has twelve sides numbered 1 through 12. Find the probability and describe the likelihood of each event. a. Rolling a number less than 9 b. Rolling a multiple of 3 c. Rolling a number greater than 6 A Punnett square is a grid used to show possible gene combinations for the offspring of two parents. In the Punnett square shown, a boy is represented by XY . A girl is represented by XX . 20. Complete the Punnett square. 21. Explain why the probability of two parents having a boy or having a girl is equally likely. 22. Two parents each have the gene combination Cs . The gene C is for curly hair. The gene s is for straight hair. a. Make a Punnett square for the two parents. When all outcomes are equally likely, what is the probability of a child having the gene combination CC ? b. Any gene combination that includes a C results in curly hair. When all outcomes are equally likely, what is the probability of a child having curly hair? 1 135 46 86 x Mother’s Genes Father’s Genes X X X X Y X
412 Chapter 10 Probability and Statistics Experimental and Theoretical Probability 10.3 How can you use relative frequencies to find probabilities? Work with a partner. a. Flip a quarter 20 times and record your results. Then complete the table. Are the relative frequencies the same as the probability of flipping heads or tails? Explain. Flipping Heads Flipping Tails Relative Frequency b. Compare your results with those of other students in your class. Are the relative frequencies the same? If not, why do you think they differ? c. Combine all of the results in your class. Then complete the table again. Did the relative frequencies change? What do you notice? Explain. d. Suppose everyone in your school conducts this experiment and you combine the results. How do you think the relative frequencies will change?

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