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Making Compound Probability Simple
Introduction
To
Basic Compound Probability
 You roll a number cube numbered from 1 to 6.
You then spin a spinner with 3 sections each with a different
color. The spinner has the colors orange, gray, and pink.
 What is the probability of rolling the following?
(2, 4, 1, 5, or 3 and orange)
You roll a cube which has the numbers 13, 7, 8, 11, 8, and 13
on it.You then spin a spinner which has 8 sections. The letters
on the spinner are G, H, E, G, H, C, E, and E.
What is the probability of (H and 13).
Compound Probability
 The likelihood that a compound event will occur; for
example: P(A or B); P(A and B and C)
 Theory that the Probability that two independent events will
occur.
Examples – Working Through It
 You enter a spelling bee at your school. You have found
that you can correctly spell words 90% of the time.
 1) What is the probability that you spell the first 5 words
correctly?
 2) What is the probability that you correctly spell the
first 4 and then miss-spell the 5th word?
 3) What is the probability that you win the contest by
spelling all 25 words correctly?
 The Atlanta Braves pitching staff has 5 left-handers and 8
right-handers.
If 2 pitchers are selected at random to warm up, what is the
probability that at least one of them is right-hander?