The monthly conscamption of Electricity in units of some fertilized of a locality is
given in following frequency distribution
Monthly
(consumpties)
140-160
160-180
180-200
200-220
220-240
240-260
260-280
No of families
3
8
15
40
50
30
10
respectively
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the monthly consuption is 200-220
no of families are 10
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