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Lesson 17 – Do Now
1) Find the solution:
2) Find the GCF of 36 and 42
3) Solve for the indicated variable
Do now Expectations:
No talking for any reason, please.
Lesson 17
SWBAT determine the
probability of the complement
of an event occurring.
Key Skills:
Sample Space
Simplifying Fractions
There are 8 questions on the
benchmark that use this skill.
Today’s Big Question(s):
Lesson 17
How is finding the complement of a
probability problem important when
solving for probability?
DI - Lesson 17
The complement of an event is all the
outcomes in the sample space that are not
included in the event.
P(event) + P(complement of event) = 1
Two events are complementary events if the
sum of their probabilities equals 1 and if one
event occurs if and only if the other does
DI - Lesson 17
1) The weather forecast predicts a 20%
chance of snow. What is the probability
that it will not snow?
DI - Lesson 17
2) If the probability of an event is 3/8, what is
the probability of its complement?
DI - Lesson 17
3) A fair die is thrown. What is the probability that
the score is not a factor of 6?
DI - Lesson 17
4) A pair of dice are rolled. What is the probability
of not rolling doubles?
5). A gumball machine contains gumballs of five different
colors: 36 red, 44 white, 15 blue, 20 green, and 5 orange. The
machine dispenser randomly selects one gumball. What is the
probability that the gumball selected is:
a.) green?
b.) not green?
c.) not orange?
d.) orange?
e.) not a color in the flag of the USA?
f.) red, white, or blue?
GP – Lesson 17
You have ___________ minutes
to silently/independently
complete the guided practice
problems on your handout.
I will walk around and give you
feedback on your work.
GP - Lesson 17
EXAMPLE: A pair of dice are rolled. What is the
probability of rolling 10 or less?
GP - Lesson 17
EXAMPLE: We are going to shuffle a deck of
playing cards. Let’s suppose we are going to
draw one card from this deck. Can you find the
probability that the card is not a king?
GP - Lesson 17
EXAMPLE: Find the probability that the card is
not a club.
GP - Lesson 17
EXAMPLE: A pair of dice will be rolled. Find the
probability that at least one of the two rolls is
an odd number.
EXAMPLE: According to the American
Veterinary Medical Association, 31.6% of
American households own a dog. What is the
probability that a randomly selected household
does not own a dog?
After school, Room 413
Parent Consent Form
Mastery Check
Answer the following questions in
your notes.
What are the three ways that one can
represent the probability of an event