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 one year ago
a student signs up for 3 courses for this semester. the probability of getting an a in class 1 is 0.3. the probability of getting an a in class 2 is 0.4. the probability of getting an a in class 3 is 0.5.
 one year ago
a student signs up for 3 courses for this semester. the probability of getting an a in class 1 is 0.3. the probability of getting an a in class 2 is 0.4. the probability of getting an a in class 3 is 0.5.

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mariomintchev
 one year ago
Best ResponseYou've already chosen the best response.0a) what is the probability of getting 3 As this semester? b) what is the probability of getting 2 As this semester? c) what is the probability of getting at least 1 A this semester?

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1a) multiply the three numbers together \(.3\times .4\times .5\) assuming independence

mariomintchev
 one year ago
Best ResponseYou've already chosen the best response.0yeah i was thinking the same thing for A but what about the others

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1b) two A's you have to work by cases

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1class 1, class 2, class 3 A A not A \(.3\times .4\times .5\) A not A A \(.3\times .6\times .5\) not A A A \(.7\times .4\times .5\) find these three numbers, add them up

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1c) at least on A is easiest found by computing the probability that you get exactly no A and subtract that number from 1

satellite73
 one year ago
Best ResponseYou've already chosen the best response.1i.e. \(1.7\times .6\times .5\)

mariomintchev
 one year ago
Best ResponseYou've already chosen the best response.0Thanks big time!
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