Probability


 * || ==Unit 11A - Probability==

Big ideas:
 * .probability equals total number of wanted outcomes over total number of possible outcomes
 * permutations-order/arrangement matters
 * combinations-order doesn't matter
 * P(A and B) --> Multiplication. P(A or B) --> Addition

Helpful hints:

Sample Problems: (click here for solutions to these problems)
 * 1) You are driving though a town with a population of 100. 60 of these people each own 1 cat, and 40 of the 60 have outdoor cats. If 25 of the 60 total cats are black cats, what is the probability that you will see a black cat outdoors? - Piper
 * 2) If you place your hand in a jar that contains 20 blue marbles, 30 white, and 7 green, what is the chance the marble chosen at random is green? -Bailey
 * 3) There is an awesome karaoke party going on at your school. If you have a group of 40 people, how many ways can you choose 5 different people at random to come on stage and sing? -- Priyanka
 * 4) Out of 10 cds, 4 are rock, 3 are country, 2 are your little sisters and 1 is full of 90s awesomeness. Today, you pick a CD without looking, listen to it on the way to school, then put it back. You do that again for two more days. What is the probability that you choose a country CD the first day, the 90s CD the second day, and then the 90s CD again the third day? What would the probability be if you didn't replace them? - Caroline ||