Homework for today: 10.5 #7-19
Or is a very important word. It means union.
And is also a very important word. It means intersection.
To find the probabilities of unions, you add them together.
Events A and B are independent events if and only if P(A and B) = P(A) x P(B)
Otherwise, A and B are dependent.
Use Venn diagrams when you're having trouble figuring things out!
We'll be talking about if/then statements soon (ex: If Mr. Schiffman owns a car, then it is a white car). If/then statements are abbreviated using ==> symbols (yes, that's a kind of arrow sign that I typed using equal and greater/less than signs). It must be proved only one way.
If and only if statements (ex: If and only if Mr. Schiffman owns a car, it is a white car) are abbreviated <==>. They must be proved going both ways.
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