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Question

Class interval 1015 1520 2025 2530
Frequency 7 12 8 10
Find the mean of the following data using Assumed mean method.

A
19.781
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B
20.836
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C
20.337
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D
21.005
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Solution

The correct option is B 20.337
Answer:- Using Shortcut method

Class Interval xFrequency
f
d=xAfd
1015137 4 28
1520 17=A 12 00
2025 23 8 6 48
2530 27 1010100
Σf=37 Σfd=120
Mean = A+ΣfdΣf=17+12037=17+3.337=20.337
Hence option (C) is correct

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