Chapter 15 - Statistics

Example 3. If the mean of the following frequency distribution is 8, find the value of p.

x 3 5 7 9 11 13
f 6 8 15 p 8 4

Solution:-

xi fi fi xi

3

6

18
5 8 40
7 15 105
9 p 9p
11 8 88
13 4 52
 

328 + 8p = 303 + 9p

328 - 303 = 9p - 8p

25 = p

 

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