- #1
lehaihua
- 1
- 0
hi all,
I have a question that i really want to know the answer.
the probability that an airplane will return in 10min is 30%, in 20min is 30%, in 30min is 0%,
in 40min is 40% according to the past history records. given that the airplane has not return
in 20min, what is the probability that the airplane will return in 30 min and in 40 min?
i really stuck on this question since the formula doesn't seem to work[P(a|b) = P(a and b)/P(a)]
please give me some hint!thx thx
I have a question that i really want to know the answer.
the probability that an airplane will return in 10min is 30%, in 20min is 30%, in 30min is 0%,
in 40min is 40% according to the past history records. given that the airplane has not return
in 20min, what is the probability that the airplane will return in 30 min and in 40 min?
i really stuck on this question since the formula doesn't seem to work[P(a|b) = P(a and b)/P(a)]
please give me some hint!thx thx