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Question

Find the mean of the following data.

Class0−1010−2020−3030−4040−50Frequency671197

A
72
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B
30
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C
18
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D
36
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Solution

The correct option is D 36
Class MarkFrequencyfx156902571753511385459405557385
N=40, fx = 1440,
Note that ¯¯¯x = fxN,
where ¯¯¯x stands for mean and N stands for the sum of frequencies.
Mean=144040=36

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