11.6 Geometric Probability
Geometry
Mrs. Spitz
Spring 2006
Objectives/Assignment
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Find a geometric probability.
Use geometric probability to solve reallife problems.
Assignments: pp. 701-701 #1-25 all
AND Ch. 11 Review pp. 708-710 #1-34.
REMINDER: CH 11 TEST IS FRIDAY!!!
Finding a Geometric Probability
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A probability is a number from 0 to 1
that represents the chance an event will
occur. Assuming that all outcomes are
equally likely, an event with a
probability of 0 CANNOT occur. An
event with a probability of 1 is just as
likely to occur as not.
Finding Geometric probability
continued . . .
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In an earlier course, you may have evaluated
probabilities by counting the number of
favorable outcomes and dividing that number
by the total number of possible outcomes. In
this lesson, you will use a related process in
which the division involves geometric measures
such as length or area. This process is called
GEOMETRIC PROBABILITY.
Geometric Probability—
probability and length
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Let AB be a segment that contains the
segment CD. If a point K on AB is
chosen at random, then the probability
that that it is on CD is as follows:
Length of CD
P(Point K is on CD) = Length of AB
A
C
D
B
Geometric Probability—
probability and AREA
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Let J be a region that contains region
M. If a point K in J is chosen at
random, then the probability that it is in
region M is as follows:
P(Point K is in region M) =
Area of M
Area of J
J
M
Ex. 1: Finding a Geometric
Probability
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Find the geometric probability that a
point chosen at random on RS is on TU.
Reminders:
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Chapter 11 Review and Chapter 11 Test
Friday
Chapter 12 Definitions due
Chapter 12 Postulates/Theorems due
Review for final exam. You must take and
pass the final exam to get credit for this
course.
Absences: More than 10, and I will fail you
per attendance policy. This includes tardies.