two companies a and b fabricate steel beam. when subjected to a 10 km point load...
two companies a and b fabricate steel beam. when subjected to a 10 km point load test, 40% if a's beam fail and 10% of b's beam fail. two beams from one of the two companies are tested. if it is equally likely that the beams come from either company:
a) what is the probability that the first beam fails?
b) if the first beam fails, what is the probability that it is from company a?
c)what is the probability that both beams will fail?
d) if the first beam fail, what is the probability that the second beam will fail?
e) let X be the number of beams that fail the test. Let p(x) be the PMF for X.
1. what is p(0)?
2.what is p(1)?
3.what is E(X)?
4 what is VAR(X)?
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two companies a and b fabricate steel beam. when subjected to a
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