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rongrong
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Statistic Help!THANKS!
Consider the trial on which a 3 is first observed in successive rolls of a four-sided die. Let A be the event that 3 is observed on the first trial. Let B be the event that at least two trials are required to observed a 3. assuming that each side has probability 1/4. find (a)P(A) (b)P(B),and (c) P(A U B)I think the S={1,2,3,4} and event A={3}, but i was confuse with the event B.
(a) P(A)=1-P(A')=1-3/4=1/4
But since i don't know event B, i can't do the rest of problem.
Consider the trial on which a 3 is first observed in successive rolls of a four-sided die. Let A be the event that 3 is observed on the first trial. Let B be the event that at least two trials are required to observed a 3. assuming that each side has probability 1/4. find (a)P(A) (b)P(B),and (c) P(A U B)I think the S={1,2,3,4} and event A={3}, but i was confuse with the event B.
(a) P(A)=1-P(A')=1-3/4=1/4
But since i don't know event B, i can't do the rest of problem.
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