Re: Will rocket reach on target

From: Joshua Cranmer <Pidgeot18@xxxxxxxxx>
Date: Wed, 10 Sep 2008 11:10:03 -0400

Mubashar Ali wrote:

Can some one help me to solve this quistion. Let p(a)=0.6 be the
probability that the rocket will destroy during its flight. And
p(b)0.02 be the probability that the engine will not start.What will
the probability that the rocket will reach into space successfuly. I've an idea to solve it. P'(a) intersection P(b) + P(a) intersection
P'(b) and P'(a) intersection P'(b)??

P(not (a or b)) = 1 - P(a or b) = 1 - [ P(a) + P(b) - P(a and b) ].

Since I am assuming that it can't be the case that the engine doesn't start and the rocket is destroyed, P(a and b) = 0. Therefore, the answer is:

1 - P(a) - P(b) = 1 - 0.6 - 0.02 = 1 - 0.62 = 0.38.
.

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