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Students of class 11 secured following marks in their statistics paper. Calculate the arithmetic mean using direct method and assumed mean method.20,44,65,28,45,67,30,50,68,39,53,70,40,60,75

Posted by Arti Kullu 4 years, 8 months ago

CBSE > Class 11 > Economics

1 answers

Gaurav Seth 4 years, 8 months ago

Sr. No.	Marks (X)	Deviation from the Assumed mean d = X − A where A = 50
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15.	20 44 65 28 45 67 30 50 (A) 68 39 53 70 40 60 75	-30 -06 15 -22 -05 17 -20 0 18 -11 3 20 -10 10 25
N = 15	ΣX = 754	Σd = -104 + 108 = 4

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=ΣX/N

X bar =50.27

4Thank You

ANSWER

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CBSE > Class 11 > Economics