find find the arithmetic mean of monthly income of 6 labour which are ₹70, ₹42, ₹85, ₹75, ₹68, ₹55
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Answer:
where,
N= Number of items
ΣX= Total of monthly income of all the families
Σd= net sum of deviations
Calculation of Mean by Direct Method
X=ΣXN=9688=121
Calculation of mean by short cut method
X=A+ΣdNor, X=75+3688or, X=75+46⇒X=121
So, mean monthly income of a family is Rs 121
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₹70+ ₹42+ ₹85+₹75+₹68+₹55
=>395÷6
=>66(approx)
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