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Question

To find mean, we use the formula

A
ni=1fixi
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B
Nni=1fixi
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C
1Nni=1fixi
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D
ni=1(fi(xi)2N)
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Solution

The correct option is C 1Nni=1fixi
mean of the data = SumofobeservationsNumberofobservations
If the data is a grouped data, frequency of each observation denoted by fi and observation by xi, then
Mean = 1Nni=1fixi

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