Download Probability Tree

Probability Tree
Lesson 2-8
Probability Tree
“Probability Tree” Diagram
…helps to determine the probability of an outcome
based on more than one event
Probability Tree
What is the probability that a two-sided coin will land on heads
twice?
Two sides = Heads/Tails
1st flip 2nd flip
H
T
total outcomes
Probability Tree
*Total outcomes = denominator
*count all “likely” outcomes that answers question = numerator
*REDUCE/simplify fraction
Probability Tree
What is the probability that a there are at least two girls in a
family of three?
1st child
B
G
2nd child
3rd child
total outcomes
Probability Tree
Create a probability tree for the roll of a die and the flip of a
coin…
Roll of Die
Flip of coin
total outcomes
Practice…
Looking back at your probability tree examples, answer the
following questions…
a) What is the P(of one heads) in your coin flips?
b) What is the P(of no heads) in your coin flips?
c) What is the P(exactly two boys) in a family of three?
d) What is the P(only girls) in a family of three?
e) What is the P(rolling 4 and landing on tails)?