Question
An analysis of monthly wages paid to workers in two firms A and B, belonging to the same industry, gives the following results::
Firm A 
Firm B 

No. of wage earners 
586 
648 
Mean of monthly wages 
Rs 5253 
Rs 5253 
Variance of the distribution of wages 
100 
121 
(i) Which firm A or B pays larger amount as monthly wages?
(ii) Which firm, A or B, shows greater variability in individual wages?
Solution
(i) Monthly wages of firm A = Rs 5253
Number of wage earners in firm A = 586
∴Total amount paid = Rs 5253 × 586
Monthly wages of firm B = Rs 5253
Number of wage earners in firm B = 648
∴Total amount paid = Rs 5253 × 648
Thus, firm B pays the larger amount as monthly wages as the number of wage earners in firm B are more than the number of wage earners in firm A.
Is there an error in this question or solution?
Solution An Analysis of Monthly Wages Paid to Workers in Two Firms a and B, Belonging to the Same Industry, Gives the Following Results::Which Firm a Or B Pays Larger Amount as Monthly Wages? Concept: Variance and Standard Deviation  Shortcut Method to Find Variance and Standard Deviation.