Posted by iris on Saturday, June 7, 2014 at 2:48am.
company A has 110 employed, company B has 750 employed and company C has 250 employed. Compute the probability that an employee selected at random comes from company A or B.

statistics  MathMate, Saturday, June 7, 2014 at 6:45am
Size of set A = A = 110,
similarly B=750, C=250
Size of Ω, sample space, S = A+B+C=1110
Random selection from equiprobability sample would be
P(A or B)=P(A)+P(B)=(A+B)/S
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