Chapter 15 - Statistics

Example 2. The following table gives the distribution of expenditure of different familes on education. Find the mean expenditure on education of a family.

Expenditure (in Rs. ) Number o families
1000-1500 24
1500-2000 40
2000-2500 33
2500-3000 28
3000-3500 30
3500-4000 22
4000-5000 16
4500-5000 7

Solution:-

Expenditure (in Rs.) No. of the families xi fi ui
1000-1500 24 1250 -3
1500-2000 40 1750 -2
2000=2500 33 2250 -1
2500-3000 28 2750=a 0 0
3000-3500 30 3250 1
3500-4000 22 3750 2
4000-4500 16 4250 3
4500-5000 7 4750 4
 

Here a = 2750, h = 500

Mean expenditure

 

Maths by Mr. M. P. Keshari
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Subjects Maths (Part-1) by Mr. M. P. Keshari
Chapter 9 Circle
Chapter 10 Tangents to a circle
Chapter 11 Geometrical Construction
Chapter 12 Troigonometry
Chapter 13 Height and Distance
Chapter 14 Mensuration
Chapter 15 Statistics
Chapter 16 Probability
Chapter 17 Co-ordinate Geometry