the electricity bill(in rupees)of 50 houses in a certain locality for the period 01-12-2010 to 28-02-2011 are as follows 900,850,700,650,850,250,275,300
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Electric bill in (Rs) Number of house (f)
class intervals
150-225 4
225-300 3
300-375 7
375-450 7
450-525 0
525-600 1
600-675 1
675-750 2
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