Practice and Problem-Solving Exercises

A Practice

See Problem 1.

8. A class tossed coins and recorded 161 heads and 179 tails. What is the experimental probability of heads? Of tails?

9. Another class rolled number cubes. Their results are shown in the table. What is the experimental probability of rolling each number?

   Number	1	2	3	4	5	6
   Occurrences	42	44	45	44	47	46

   See Problem 2.

   Graphing Calculator For Exercises 10–12, define a simulation by telling how you represent correct answers, incorrect answers, and the quiz. Use your simulation to find each experimental probability.

10. If you guess the answers at random, what is the probability of getting at least two correct answers on a five-question true-or-false quiz?
11. If you guess the answers at random, what is the probability of getting at least three correct answers on a five-question true-or-false quiz?

12. A five-question multiple-choice quiz has five choices for each answer. What is the probability of correctly guessing at random exactly one correct answer? Exactly two correct answers? Exactly three correct answers? (Hint: You could let any two digits represent correct answers, and the other digits represent wrong answers.)

    See Problem 3.

    A jar contains 30 red marbles, 50 blue marbles, and 20 white marbles. You pick one marble from the jar at random. Find each theoretical probability.

13. P(red)
14. P(blue)
15. P(not white)
16. P(red or blue)

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