Algebra 2
Quiz 12.1, 12.2, 9.7
Name _________________________________________
In a poll, gymnasts were asked, “How many seconds long was your longest handstand on the balance beam? Use the
results below for Questions 1 and 2.
Duration (seconds)
Number of Respondents
0-2
14
3-5
27
6-10
19
11-20
18
21-30
13
31-60
15
>60
24
Total
130
1. Find the probability and graph the probability distribution.
2. Find P(6 – 30) seconds.
Use the table at the right to find each probability.
3. P(teacher | yes)
4. P(no | teacher)
5. P(student | no)
Teachers
Students
Yes
12
45
No
20
23
6. At a restaurant, customers get to choose one of four vegetables with any main course. About 33% of the customers choose
green beans, and about 28% choose spinach. What is the probability that a customer will choose beans or spinach?
A jar contains four blue marbles and two red marbles. Suppose you choose a marble at random, and do not replace it.
Then you choose a second marble. Find the probability of each event.
7. You select a blue marble and then a red marble.
8. Both marbles are red.