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    Question

      Mean salary of total 100 employees was given to be 800. Also, mean salary of male and female employees was 400 and 900 respectively. Find the percentage of female employees.

    A 30% Correct Answer Incorrect Answer
    B 40% Correct Answer Incorrect Answer
    C 20% Correct Answer Incorrect Answer
    D 80% Correct Answer Incorrect Answer
    E 10% Correct Answer Incorrect Answer

    Solution

    Use formula of combined mean to find Nf / (Nf+Nm). Combined Mean = {Nm (400) + Nf (900)} / 100 800 * 100 = (100 – Nf) 400 + Nf 900 80,000 = 40,000 – 400 Nf + 900 Nf 40,000 = 500 Nf Nf = 80 % of female employees = 80/100 = 0.8 or 80%

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