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Question

Find the mean of the following data, by using the assumed mean method.
Class Interval
010
1020
2030
3040
4050
Frequency
7
8
12
13
10

  1. 10
  2. 30
  3. 27.2
  4. None of these

A
27.2
B
10
C
None of these
D
30
Solution
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Answer:-

Class intervalFrequency (fi) xi=lower limit + upper limit2fixi
0107 5 35
1020 8 15 120
2030 12 25 300
3040 13 35 455
4050 1045 450
Σfi=50 Σfixi=1360
Mean = ΣfixiΣfi=136050=27.2

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