Warm Up

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Warm Up
Problem of the Day
Lesson Presentation
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Warm Up Write impossible, unlikely, as likely as
not, likely, or certain to describe each
event. 1. A particular persons birthday falls
on the first of a month. 2. You roll an odd
number on a fair number cube. 3. There is a 0.14
probability of picking the winning ticket. Write
this as a fraction and as a percent.
unlikely
as likely as not
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Problem of the Day Max picks a letter out of
this problem at random. What is the probability
that the letter is in the first half of the
alphabet?
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Learn to find the experimental probability of an
event.
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Insert Lesson Title Here
Vocabulary
experiment outcome experimental probability
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An experiment is an activity involving chance
that can have different results. Flipping a coin
and rolling a number cube are examples of
experiments.
The different results that can occur are called
outcomes of the experiment. If you are flipping a
coin, heads is one possible outcome.
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Additional Example 1A Identifying Outcomes For
each experiment, identify the outcome
shown. tossing two coins
outcome shown tails, heads (T, H)
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Additional Example 1B Identifying Outcomes For
each experiment, identify the outcome
shown. rolling two number cubes
outcome shown (2, 6)
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Check It Out Example 1A For each experiment,
identify the outcome shown. spinning two spinners
outcome shown C3
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Check It Out Example 1B For each experiment,
identify the outcome shown. tossing two coins
outcome shown heads, heads (H, H)
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Performing an experiment is one way to estimate
the probability of an event. If an experiment is
repeated many times, the experimental probability
of an event is the ratio of the number of times
the event occurs to the total number of times the
experiment is performed.
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Writing Math
The probability of an event can be written as
P(event). P(blue) means the probability that
blue will be the outcome.
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Additional Example 2 Finding Experimental
Probability For one month,
Mr. Crowe recorded the time at which his train
arrived. He organized his results in a frequency
table.
Time 650-652 653-656 657-700
Frequency 7 8 5
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Additional Example 2A Continued
Find the experimental probability of the train
arriving between 657 and 700.
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Additional Example 2B Finding Experimental
Probability
Find the experimental probability of the train
arriving before 657.
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Check It Out Example 2 For one month, Ms.
Simons recorded the time at which her bus
arrived. She organized her results in a frequency
table.
Time 431-440 441-450 451-500
Frequency 4 8 12
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Check It Out Example 2A
Find the experimental probability that the bus
will arrive before 451.
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Check It Out Example 2B
Find the experimental probability that the bus
will arrive between 441 and 450.
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Additional Example 3 Comparing Experimental
Probabilities Erika tossed a cylinder 30 times
and recorded whether it landed on one of its
bases or on its side. Based on Erikas
experiment, which way is the cylinder more likely
to land?
Outcome On a base On its side
Frequency llll llll llll llll llll llll l
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Additional Example 3 Continued
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Check It Out Example 3 Chad tossed a dome 25
times and recorded whether it landed on its base
or on its side. Based on Chads experiment, which
way is the dome more likely to land?
Outcome On its side On its base
Frequency llll llll llll llll llll
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Check It Out Example 3 Continued
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Insert Lesson Title Here
Lesson Quiz Part I
1. The spinner below was spun. Identify the
outcome shown.
outcome green
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Insert Lesson Title Here
Lesson Quiz Part II
Sandra spun the spinner above several times and
recorded the results in the table.
2. Find the experimental probability that the
spinner will land on blue. 3. Find the
experimental probability that the spinner will
land on red. 4. Based on the experiment,
what is the probability that the spinner will
land on red or blue?