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The mean of monthly salary of 12 employes of a firm is rupees 14,500.if one more person joins the firm who gets 18,400 per month . what is the mean montly

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Mean = Sum . of Observation / No . of Observation Here, Mean = Sum of Salary of 12 mens / 12 Sum of salary of 12 mens = Mean * 12 =14500 * 12 = 174000

New Mean = Sum of salary of first 12 mens + salary of new guy/ 13 = 174000 + 18400 / 13 = 192400 / 13 = Rs 14800

Answer ⇒ New Mean Monthly Salary Now = Rs 14800

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*** Note: The unit of currency used in this answer is not rupees, but taka (the currency of Bangladesh, where I am from).

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SOLUTION - Given,

mean of 12 people salary = Tk. 14, 500 one more person salary = Tk. 18, 400

To find out, what is the total mean of 13 people?

mean of 12 employees' (monthly salary)= Tk. 14, 500

Mean = Sum / Number so, Sum = Number * Mean

sum of 12 employees' (monthly salary) = Tk. (14, 500 × 12 ) = Tk. 174, 000

sum of 13 employees' (monthly salary) = Tk. ( 174, 000 + 18, 400 ) = Tk. 192, 400