pls give the formula for arithmetic mean!
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formulas of calculating arithmetic mean are
1> direct method
mean = sum of number / no of observation
mean = summation FX / summation F
2> short cut method
A + summation dx/summation F
A-> assumed mean
dx= x- A
3> step deviation method
A+ summation ds/ summation F x c
ds = dx/ common difference
c = common difference
1> direct method
mean = sum of number / no of observation
mean = summation FX / summation F
2> short cut method
A + summation dx/summation F
A-> assumed mean
dx= x- A
3> step deviation method
A+ summation ds/ summation F x c
ds = dx/ common difference
c = common difference
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