Section 2.8 notes.notebook
October 10, 2012
Section 2.8 ­ Probability and Odds
probability of an event
measure of the likelihood that the event will occur
outcomes
different possible results in an experiment
event
a collection of outcomes
favorable outcomes
the outcomes for a particular event that are being considered
theoretical probability number of favorable outcomes total number of outcomes
experimental probability ­based on repetitions of an actual experiment P = # of favorable outcomes observed
total # of trials
odds of an event
odds = # of favorable outcomes
# of unfavorable outcomes
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Section 2.8 notes.notebook
October 10, 2012
1. You toss a six­sided number cube 20 times. For twelve of the tosses the number tossed was 3 or more.
a. What is the experimental probability that a number tossed is 3 or more?
b. What are the odds that a number tossed is 3 or more?
2. Find the probability of randomly choosing a red marble from the given bag of red and white marbles.
a. Number of red marbles: 16
Total number of marbles: 64
b. Number of white marbles: 13
Total number of marbles: 20
3. Find the odds of randomly choosing the indicated letter from a bag that contains the letters in the name of the given state.
a. S; Mississippi
b. N; Pennsylvania
4. What is the probability that you will roll an even number on a toss of a six­sided number cube?
What are the odds?
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Section 2.8 notes.notebook
October 10, 2012
5. A machine shop averages 25 defects per million parts made. If you randomly select a part from a box, what is the probability that the part is defective?
6. The population of the United States is about 265 million. The probability that a citizen lives in Indiana is 0.022. What is the population of Indiana?
Toss a coin 20 times. What is the experimental probability that the coin lands on heads?
Heads
Tails
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Section 2.8 notes.notebook
October 10, 2012
You toss a six­sided number cube 20 times. What is the experimental probability that the number tossed is a 3 or more.
1
2
3
4
5
6
You spin the spinner 10 times. What is the experimental probability that it lands on green or purple?
Purple
Green
Red
Orange
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