Download Math 7 (Holt)

Math 7 (Holt)
Test Unit 10
Name _________________________
Date _______________ Period ____
Reasoning with Probability. Determine Probability & Possible Outcomes
(10.1-10.5)
_______ / 32 points = _______%
Probability Reasoning.
1. A bag contains five yellow disks, eight red disks, four orange disks, and two
blue disks. All the disks are the same size.
A. Would you be more likely to pull an orange or a yellow disk? ____________
B. What color disk are you least likely to pull?
____________
C. Explain how you can tell if you are more likely to pull a red disk
than a blue disk.
________________________________________________
Determine if each event is impossible, unlikely, as likely as not, likely, or certain.
4. There are 4 pens and 10 pencils in a drawer.
A. How likely is it to pull out a pencil?
___________________
B. How likely is it to pull out a crayon?
___________________
5. There are 8 yellow cards and 8 green cards in a box.
A. How likely is it to pull out a green card from the box? __________________
B. How likely is it to pull a card from the box?
Unit 10 Test (HOLT)
__________________
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Find the experimental probability.
6. At a restaurant, 32 out of 60 customers order a dessert. What is the experimental
probability that the next customer will order dessert?
6. __________
7. After a movie premiere, 100 out of 125 people surveyed said they like the movie.
What is the experimental probability that the next person did not like the movie?
7. ___________
8. Sarah was throwing darts at a target. She hit the yellow ring 6 times, the blue ring 9
times, and the purple ring 8 times. What is the experimental probability that the
next dart will hit the purple ring?
8. ___________
Find the theoretical probabilities using the given spinner for #9-11.
9. P(4) = ______
10. P(an odd number) = ________
11. P(number >5) = ________
Applications with probability.
12. Jaime has a bag of candy with some tootsie rolls and some jolly ranchers in it. He
tells you that if you draw a candy from his bag, the theoretical probability that you draw
a jolly rancher is 35%. He has 60 pieces of candy in the bag. How many pieces of candy
in his bag must be jolly ranchers?
12. ______________
13. Raul rolls a 1-6 number cube. On the first four rolls, he gets a 3, 5, 5, and a 5. He
predicts he has a 75% chance of getting a 5 on his next roll. Do you agree? Explain.
Do you agree? ________
Explain: ________________________________
__________________________________
Unit 10 Test (HOLT)
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Determine possible outcomes.
14. For dinner, Fernando has a choice of hamburger (h), pasta (p), or chicken (c) and
choice of fruit(f) or vegetable(v).
A. What are all the possible dinners he can have?
B.
How large is the sample space?
___________
Multiple Choice: Circle the best answer.
15. There are 6 arcades in town. Each arcade has 9 different games. How many
choices of games are there?
A. 3
C. 15
B. 48
D. 54
Decide if the events are independent or dependent.
16.
Spinning a spinner and rolling a number cube
16. ______________
17.
Picking a marble from a bag, replaces it, then picks again.
17. ______________
18.
Choosing a sock from a drawer, then picking a
sock without replacing the first.
18. ______________
Find the probabilities.
19. Greg has 4 nickels, 5 quarters, and 2 dimes in his pocket. If he randomly chooses
two coins, what is the probability that both are nickels?
19. ______________
20. Katie is guessing on 1 true-false question and 1 multiple-choice question
with answer choices A, B, C, and D. What is the probability that she guesses both
answers correctly?
20. ______________
Unit 10 Test (HOLT)
Page 3
Solve Percent Problems (6.1 – 6.5)
_______ / 18 points = _______%
Write the percent as a fraction in simplest form and as a decimal.
21.
64%
simplified fraction: __________
decimal: ________
Write each number as a percent.
7
 _____%
5
22.
23.
0.053  _____ %
Compare. Write <, >, or =. Justify your answers.
24.
0.6
6%
25.
95%
24
25
Multiple Choice: Circle the correct answer.
26. Find 9% of 40.
A. 0.36
B. 3.6
C. 36
D. 360
Solve. Show work to justify your answers.
27.
27 is what percent of 30?
27. __________
28.
80 is 32% of what number?
28. __________
Find the error.
29. Levi was asked to find the percent of change when his monthly allowance went
from $40 to $45. He said his allowance increased by about 8%. Levi is not correct.
Describe his error. Then find the correct percent of change answer.
Levi’s work:
40
 0.8
45
Increased by
about 8%
Unit 10 Test (HOLT)
Describe his error:
__________________
Find the correct Percent of
Change:
__________________
__________________
__________________
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