(a) Given that, Number of male employees (M) = 45 Number of female employees (F) = 15 Mean salary of male employee (xM)= ₹ 5000 Total number of employees = (M + F)= 45 + 15 = 60 Mean salary of employees (xMF) = ₹ 4800 Let mean salary of female employee is xF By formula, xMF=