In this video I explain how to solve probability problems involving dependent events that are "or" problems.
For example,"What is the probabilty of picking a white short or a black shirt from a box of shirts?"
In order to solve these problems involving dependent events using "or" use the formula:
P(AorB) = P(A) +P(B) -P(A and B)
In this video you will learn how to solve dependent probability events.
With dependent events the result of one event impacts other events. In other words the dependent events depend on the actions of the previous event.
This video focuses on dependent events with "and" in the problem.
An example dependent event would be, "What are the chances of picking a red marble and then a blue marble?"
Dependent events can be solved using the formula:
P(A and B) = P(A) xP(B,givenA)
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Help with finding the probability of Dependent Events
This video corresponds with Common Core Standard HSS CPA 2
Some properties of Dependent Events
Event A occurring affects the probability of event B occurring
You will usually see these words " without replacing"
Use P(A and B) = P (A intersection B) = P(A) * P (B/A)
0:41 Example Problem/Dependent Event A jar has the same number of marbles, 3 red, 5 blue, 6 yellow. The marbles are chosen at random from the jar. The second marble is chosen without replacement. What is the probability you get a green and a yellow marble?
1:59 An aquarium contains 6 male goldfish. You randomly select a fish from the tank and do not replace it, and then randomly select a second fish. What is the probability that both fish will be male?
2:58 A random sample of parts coming off a machine. He found 5 out of 100 parts are bad. If he chooses a new sample,what is the probability of choosing a bad part if he doesn't replace the first one?
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Probability of Dependent Events
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At MooMooMath we provide helpful Math and Geometry videos to help you figure out how to solve Math problems or review old Math concepts you may need to refresh. If you’re a Math student or teacher, we'd love to have you subscribe and join us!
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