Unit 7 Probability Test Study Guide
Geometry Reference Sheet - Year Long Guide
● Describe events as subsets of a sample space
● Understand independent events
● Understand conditional probability
● Construct and interpret two-way tables
1. A bag contains some red-colored and some
blue-colored marbles. First a red-colored
marble is drawn and then, without replacing
the first marble, a blue-colored marble is
drawn. Are the two events dependent or
independent?
2. Kyle works at a local music store. The store
receives a shipment of new CDs in a box. In
the shipment, there are 10 country CDs, 5
rock CDs, 12 hip hop CDs, and 3 jazz CDs.
What is the probability that the first CD
that Kyle pulls from the box will NOT be
hip hop?
a. ⅗
c. 12/30
b. ⅖
d. 17/30
Answer: Dependent
Answer: 3/5
3. Kyle works at a local music store. The
store receives a shipment of new CDs in a
box. In the shipment, there are 10 country
CDs, 5 rock CDs, 12 hip hop CDs, and 3 jazz
CDs. What is the probability that Kyle will
select a jazz CD from the box, and then,
without replacing the CD, select a country
CD?
a. 1/29
b. 10/290
Answer: 1/29
4. A card is drawn from a deck of 52 playing
cards. What is the probability that it is a king
or a red card?
A.
B.
C.
D.
3/13
4/13
5/13
7/13
c. 10/320
d. 1/32
Answer: 7/13
5. In a class, there are 30 girls and 15 boys.
20 of the 30 girls like football and the rest of
them like badminton. 10 of the 15 boys like
football and the rest of them like badminton.
Find the probability that the student selected
randomly will be a boy who likes football?
A.
B.
C.
D.
⅔
2/15
2/9
1
6. A card is drawn from a deck of 52 playing
cards. What is the probability that it is a king
AND a BLACK card?
A.
B.
C.
D.
1/13
1/52
1/26
2/13
Answer: 1/13
Answer: 2/9
Use the table below to answer questions 7
8. What is the probability of a middle school
student that plays an instrument, given they
play a team sport?
(Hint: the denominator is the number of
students who play a team sport)
and 8.
7. What percent of people who play an
instrument do not play a team sport?
A.
B.
C.
D.
Answer: 4/5
80%
40%
27.3%
90.1%
Answer: 27.3%
Use the following table for questions 9, 10, 11.
9. Fill in the following frequency table:
Biology
Chemis
try
Physics
Total
Female
18
15
14
47
Male
8
6
19
33
Total
26
21
33
80
10. This table shows the number of female
and male students in each science class. How
many students are taking biology?
11. What is the probability that a student will
take chemistry, given that they are female (use
the table above)?
Answer: 26
Answer: 45/47