A shopkeeper has recorded his earnings and expenditure for 5 working days as shown in the table. Calculate the average amount of profit he earns daily.

Earnings $350 $300 $450 $300 $450

Expenditure $180 $150 $270 $100 $300

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Solution

$P r o f i t = E a r n i n g s - E x p e n d i t u r e$

Tabulating the profits for each day, we get:

Earnings
in $ 350 300 450 300 450

Expenditure in $ 180 150 270 100 300

Profit
in $ 170 150 180 200 150

$So, the average daily profit = \frac{$ 170 + $ 150 + $ 180 + $ 200 + $ 150}{5} = \frac{$ 850}{5} = $ 170$

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Expenditure (in rupees) (x_i)	Frequency (f_i)	Expenditure (in rupees) (x_i)	Frequency (f_i)
100-150 150-200 200-250 250-300	24 40 33 28	300-350 350-400 400-450 450-500	30 22 16 7

The table below
shows the daily expenditure on food of 30 households in a locality

Daily expenditure (in Rs.)	$100 - 150$	$150 - 200$	$200 - 250$	$250 - 300$	$300 - 350$
No. of households	$6$	$7$	$12$	$3$	$2$

Find the mean and the median daily expenditure on food.

The table below shows the daily expenditure on food of 25 households in a locality.

Daily expenditure (in Rs)	100 − 150	150 − 200	200 − 250	250 − 300	300 − 350
Number of households	4	5	12	2	2

Find the mean daily expenditure on food by a suitable method.

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