An analysis of monthly wages paid to the workers in two firms A and B belonging to the same industry gives the following result: Firm AFirm BNumber of workers500600Average monthly wageRs. 1860Rs. 1750Variance of distribution of wages81100 The average of monthly wage and variance of distribution of wages of all the workers in the firms A and B taken together are

• A. Rs. 1860, 100
• B. Rs. 1750, 100
• C. Rs. 1800, 81
• D. None of the above