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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 -

    Size of set A = |A| = 110,
    similarly |B|=750, |C|=250
    Size of Ω, sample space, S = |A|+|B|+|C|=1110

    Random selection from equi-probability sample would be
    P(A or B)=P(A)+P(B)=(|A|+|B|)/S

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