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Tabular Representation of Statistical Data — Maths STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9MathsTabular Representation of Statistical Data4 Marks
Question
The following cumulative frequency distribution table shows the daily electricity consumption (in KW) of 40 factories in an industrial state.
Consumption (in KW)
No. of factories
Below 240
1
Below 270
4
Below 300
8
Below 330
24
Below 360
33
Below 390
38
Below 420
40
  1. Represent this as a frequency distribution table.
  2. Prepare a cumulative frequency table.
✓

Answer

  1.  
Consumption(in KW)
No. of factories
Class interval
Frequency
Below 240
1
0-240
1
Below 270
4
240-270
4 - 1 = 3
Below 300
8
270-300
8 - 4 = 4
Below 330
24
300-330
24 - 8 = 16
Below 360
33
330-360
33 - 24 = 9
Below 390
38
360-390
38 - 33 = 5
Below 420
40
390-420
40 - 38 = 2
  1.  
Class interval
Frequency
Consumption(in KW)
No. of factories
0-240
1
More than 0
40
240-270
3
More than 240
40 - 1 = 39
270-300
4
More than 270
39 - 3 = 36
300-330
16
More than 300
36 - 4 = 32
330-360
9
More than 330
32 - 16 = 16
360-390
5
More than 360
16 - 9 = 7
390-420
2
More than 390
7 - 5 = 2
 
 
More than 420
2 - 2 = 0
 
N = 40
 
 

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