Unit 1

Warm up
1.
What is the probability of choosing a red card from
a standard deck of cards?
2.
What is the probability of choosing a king from a
deck of cards?
3.
50%
8%
Given that a card is black, what is the probability
that you choose a 4?
2/26 = 8%
Probability Tables
A Little Vocabulary
Athletics
Music/Arts
SGA
Other
Total
Male
Male total
Female
Female
total
Total
Athletics
total
Music/arts
total
SGA total
Other
total
Table total
Joint Probability
individual cell
table total
Marginal Probability
column or row total
table total
Conditional Probability
individual cell
specified row or column
Example 1
 Using the table below, what is the
joint probability of a female that is
involved in SGA?
0/30 = 0%
Athletics
Music/Arts
SGA
Other
Total
Male
10
5
1
2
18
Female
5
6
0
1
12
Total
15
11
1
3
30
Example 2
 Using the table below, what is the
marginal probability of choosing
someone who is involved with
athletics?
15/30 = 50%
Athletics
Music/Arts
SGA
Other
Total
Male
10
5
1
2
18
Female
5
6
0
1
12
Total
15
11
1
3
30
Example 3
 Using the table below, what is the
conditional probability given that a
person is male, that they are
involved in Music/Arts?
5/18 = 28%
Athletics
Music/Arts
SGA
Other
Total
Male
10
5
1
2
18
Female
5
6
0
1
12
Total
15
11
1
3
30

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