Name: _________________________
7th /Honors Grade Mathematics
Date: ______________
Mrs. Mazzarella/Mrs. Sammon
12-2 Experimental Probability of Simple Events: Pages 375-380
Essential Question: How can you find the experimental probability of a simple event?
Experimental Probability vs. Simple Probability
- Experimental Probability is probability that is always based on events that already occurred.
Determining the experimental probability of an event can and will yield any number of outcomes.
- Simple Probability is probability based on a given sample space and there is only one outcome.
Page 375 Explore Activity
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Page 376 Example 1 Real World
Then convert into a percent.
Substitute the results recorded in the table. Write the probability as a decimal and then a percent.
Color
RED
BLUE
GREEN
YELLOW
Experimental Probability
𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦 𝑜𝑓 𝑡ℎ𝑒 𝑒𝑣𝑒𝑛𝑡
𝑡𝑜𝑡𝑎𝑙 𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑡𝑟𝑖𝑎𝑙𝑠
Page 376 Example 1 Real World
Experimental Probability of:
RED:
YELLOW:
BLUE
Page 378 GUIDED Practice
Page 379 Independent Practice
LESSON
12-1
Probability
Practice and Problem Solving: C
Find each probability. Write your answer in simplest form.
1. picking a blue shirt from a drawer with 8 blue shirts and 2 white shirts
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2. drawing a vowel from letter tiles that spell out MATHEMATICS
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3. A spinner is divided into 8 equal sections: 4 red, 2 white, 1 green, and
1 blue. What is the probability that the spinner lands on blue or white?
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There are 6 cans of soup in a kitchen cabinet: 2 chicken noodle,
3 tomato, and 1 vegetable.
4. You select a can without looking. What is the probability that you will not choose chicken
noodle soup?
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5. Suppose you use a can of chicken noodle soup from the original
6 cans. Then your father adds 2 cans of vegetable soup and 1 can of tomato soup to
those left in the kitchen cabinet. What is the probability that you will choose tomato soup
now?
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6. Later, your mother adds 7 more cans of soup to the cabinet, some chicken noodle and
4
some vegetable. Now the probability of not choosing chicken noodle soup is
. How
5
many cans of chicken noodle soup did your mother add to those already in the cabinet?
Explain.
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Use the picture at the right.
7. Write one number in each section of the spinner at right. Then write
a probability problem about the spinner. The answer to your problem should be between
1
and 1.
2
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LESSON
12-2
Experimental Probability of Simple Events
Practice and Problem Solving: D
Find each experimental probability. The first one is done for you.
1. Kathy played a game of darts. She threw 15 darts and hit the target
9 times. What is the experimental probability that Kathy will hit the target the next time
she throws a dart?
a. What is the number of favorable outcomes? _________________
9
15
b. What is the total number of trials? _________________
c. What is the experimental probability that Kathy will hit the target the next time she
throws a dart?
9
3

15
5
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2. Between 10 A.M. and 11 A.M., 48 people came into Brad’s store.
40 of them made a purchase. What is the experimental probability that the next person
to come into the store will make a purchase?
a. What is the number of favorable outcomes? _________________
b. What is the total number of trials? _________________
c. What is the experimental probability the next person to come into the store will make
a purchase?
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3. Sharona kept track of the colors of cars that passed her house one afternoon. She
collected her data in the table below.
Car Color
Number
Car Color
Number
red
12
white
42
blue
9
silver
36
black
32
yellow
1
What is the experimental probability that the next car will be silver?
a. What is the number of favorable outcomes? _________________
b. What is the total number of trials? _________________
c. What is the experimental probability that the next car to pass Sharona’s house will
be silver?
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d. What is the experimental probability that the next car to pass Sharona’s house will
not be silver?
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