please pass out your advisory folders! probability what do you think the chances are…?
TRANSCRIPT
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PLEASE PASS OUT YOUR ADVISORY FOLDERS!
PROBABILITY
What do you think the chances are…?
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Probability…what is it?
Probability is the chance of an event occurring.
Its value ranges from 0 to 1. 0 means – not going to happen 1 means – always will happen We find probability by measuring what
we want to happen and putting it over the total outcomes that can happen
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Example A number cube, which is how dice is
referred to as on the PSSA, is rolled. What is the probability we roll an odd number?
How many odd numbers are on a number cube?
How many total numbers (outcomes) are on a number cube?
P(odd) = We can reduce this fraction
P(odd) =
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You try one
A bag of marbles contains 8 red, 5 blue, 1 black, and 2 green marbles. What is the probability of selecting a green marble?A) B)C)D)
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What if two or more things need to happen? Find the probability of each individual
event. If they need to happen together, find the
product of the events. Formula: P(event #1) • P(event #2) =
P(both events)
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Example
Find the probability of flipping a coin and getting heads while rolling a number greater than 4 on a number cube.
P(heads) = P(greater than 4) = P(heads and greater than 4) =
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You try one
Find the probability of spinning a red on the spinner and rolling an even number?
A) B)C)D)