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.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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