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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 $$\frac {1}{N}\displaystyle \sum_{i=1}^{n}f_ix_i$$
mean of the data = $$\frac{Sum \quad of \quad obeservations}{Number \quad of \quad observations}$$
If the data is a grouped data, frequency of each observation denoted by $$f_i$$ and observation by $$x_i$$, then
Mean = $$\frac {1}{N}\displaystyle \sum_{i=1}^{n}f_ix_i$$

Mathematics

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