Question

Find out mean of sales and expenses of following 10 firms:

Firms	:	1	2	3	4	5	6	7	8	9	10
Sales (₹ in '000)	:	50	50	55	60	65	65	65	60	60	50
Expenses (₹ in '000)	:	11	13	14	16	16	15	15	14	13	13

Answer 1

Firm	Sales (X) (Rs in '000)	Expenses (Y) (Rs in '000)
1 2 3 4 5 6 7 8 9 10	50 50 55 60 65 65 65 60 60 50	11 13 14 16 16 15 15 14 13 13
	ΣX = 580	ΣY = 140

$\overline{\mathit{X}}=\frac{\Sigma X}{N}=\frac{580}{10}=58$
So, mean sales is Rs 58,000

$\overline{Y}=\frac{\Sigma Y}{N}=\frac{140}{10}=14$
So, mean expenses is Rs 14,000