Unit 16 Lesson 2
Conditional Probability
Pick up the “Probability Rules!” notes page
off the back table, and grab a calculator.
What is the probability of picking a senior?
400
8
=
= 61.538%
650
13
What is the probability of picking a junior and parks in the reserved lot?
75
3
=
= 11.538%
650 26
What is the probability of picking a junior given that they park in the reserved lot?
75
3
=
= 37.5%
200
8
Male - .35
Sockeye - .58
Female - .65
Salmon
Chinook - .42
Male - .45
Female - .55
What is the probability that a salmon is male, given that it is a
Chinook?
.35 = 35%
What is the probability that a salmon is Chinook and female?
.42 x .55 = .231 = 23.1%