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Fund B Notes 10.4.notebook
May 09, 2013
Before we...
Learned how to find the probability of two events.
Today we will...Discover the formulas for Disjoint or
Overlapping Events.
Why?
10.4 Probability of Disjoint or Overlapping events.
Summary...
Assign: 10.4 Pg.
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Fund B Notes 10.4.notebook
May 09, 2013
10.3 Probabilities of Disjoint and Overlapping Events
Yesterday, we did a section dealing with two events (Spinning a
spinner then flipping a coin, for example). Using more than one
event is called Compound Events.
Two events can either be Disjoint (mutually exclusive), or they
can be Overlapping. The following examples will better show the
meaning of each.
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Fund B Notes 10.4.notebook
May 09, 2013
Disjoint:
If A and B are any disjoint events, then the probability of A or
B is:
P(A or B) = P(A) + P(B)
EX. A card is randomly selected from a standard deck of 52
cards. What is the probability that it is a 10 or a face card?
P(A or B) = P(A) + P(B)
A bag of marbles contains 4 red, 2 blue, and 7 orange. You
select one. Find the probability of choosing a red marble or an
orange marble.
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Fund B Notes 10.4.notebook
May 09, 2013
Overlapping:
If A and B are overlapping events, then the probability of A or
B is:
P(A or B) = P(A) + P(B) - P(A and B)
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Fund B Notes 10.4.notebook
May 09, 2013
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Fund B Notes 10.4.notebook
May 09, 2013
A die is rolled. What is the probability of rolling a number
greater than 4 or even?
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Fund B Notes 10.4.notebook
May 09, 2013
P(A) is another way of saying: P(not A)
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Fund B Notes 10.4.notebook
May 09, 2013
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