Theoretical probability : whatâ€™s suppose to happen P(event) = Number of favorable outcomes
Number of possible outcomes
Experimental probability : is based on the results of a sample or experiment. (what actually happened)
P(event) = Number of favorable outcomes
Total number of times the experiment was performed
9.
Kari and Susie are playing a game with three colored markers- green, red and blue. On her next turn, if Susie chooses a marker at random and it is green, she wins the game. What are the outcomes that could happen? green, red, blue What is the probability of choosing a green marker? 1/3, 0.3, 33 1/3%
10.
Nicole found out that Jessica was born in May. What is the probability that she can guess the correct date of Jessicaâ€™s birthday on the first try? How many outcomes are possible? 31 days in May What is the probability of the event? 1/31
11.
More Probability and other stuff If you roll one die what is the probability that the number that shows is greater than 4? If I roll one die the probability that the number that shows is greater than 4 is 2/6 which simplifies to 1/3. The possibilities would be 1, 2, 3, 4, 5, 6. The only two numbers greater than 4 would be 5 and 6.
12.
I have 3 pennies and 5 dimes in my pocket. If I pull out one coin what is the probability that I get a dime? The probability that I get a dime is 5 chances out of eight. 5/8, 0.625, 62.5%
What is the probability that the spinner will land on . .
Red
2/5, 0.4, 40%
Red or blue
1, 1.0, 100%
Green
0, 0, 0%
Not red
3/5, 0.6, 60%
Red Red Blue Blue Blue
14.
EXAMPLE 2 Finding Experimental Probability You roll a number cube 100 times. Your results are given in the table below. Find the experimental probability of rolling a 6 . = 0.18 = 18% P (rolling a 6 ) = 18 100 Number of favorable outcomes Total number of rolls The experimental probability of rolling a 6 is 18% or 9/50 . ANSWER
15.
EXAMPLE 2 Finding Experimental Probability You roll a number cube 100 times. Your results are given in the table below. Find the experimental probability of rolling a 1 or 2 . = 0.32 = 32% 17+15= 32 P (rolling a 1 or 2 ) = 32 100 Number of favorable outcomes Total number of rolls The experimental probability of rolling a 1 or 2 is 32% or 8/25 . ANSWER
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