Question

A survey of domestic consumption of electricity gave the following distribution of the no. of units consumed:
Number of
Number of
Number of
Number of
units
consumer's
units
0-200
800-1000
45
9
200-400
18
1000-1500
38
400-600
27
1500-2000
20
600-800
32
2000 and above
2
Use a graphical method to calculate as accurately as possible the two quartiles and hence find the quartile deviation.
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Answer 1

Answer:

200- 400 is the your answer