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Question 6:

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.

Answer:

To find the class mark (xi) for each interval, the following relation is used.

Class size = 50

Taking 225 as assumed mean (a), di, ui, fiui are calculated as follows.

Daily expenditure (in Rs)

fi

xi

di = xi − 225

...

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