Question

# To find mean, we use the formula

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

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 $$x_i$$, thenMean = $$\frac {1}{N}\displaystyle \sum_{i=1}^{n}f_ix_i$$Mathematics

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