What is the formula for arithmetic mean for frequency distribution?

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Summation of (f.x)/summation of f.
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Summation of (f.x)/summation of f.
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(fi.xi)/N where, N= summation of f.
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Summation of the product (fx)/summation of frequency.
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B. Sc. (PMCs), M. Sc. (Electronic Media)

Arithmatic Mean See the picture.
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