Draw a plan and calculate the area of a level ground using the information given below.

Metre to C

To D 120

To E 180

220

210

120

80

200 to B

From A

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Solution

Here, we observe that

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Daily wages (in ₹)	60−90	90−120	120−150	150−180	180−210
No. of Workers	11	14	25	12	8

[S c a l e : 20 m = 1 c m]

Expenditure (in ₹)	140−160	160−180	180−200	200−220	220−240
Number of families	5	25	f₁	f₂	5

Given below are the weekly wages of 200 workers in a small factory.

Calculate the maean weekly wages of the workers.

Find the mean and variance for the following frequency distribution.

Classes	0-30	30-60	60-90	90-120	120-150	150-180	180-210
Frequencies	2	3	5	10	3	5	2

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