CBSE BOARD X, asked by studyhard2005, 4 months ago

Class : 10
Sub : Maths
Ch : Statistics

Pls solve as soon as possible​

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Answers

Answered by sureshpatnala
8

Answer:

p= 20.............

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Given : The mean of the data is 24.

To find : The value of p?

Solution :

The data is arranged as,

Class Intervals         Frequency (f)        Class Marks (x)      f\times x=fxf×x=fx

   0-10                            15                         5                           75

   10-20                         20                        15                          300

   20-30                        35                        25                         875

   30-40                         p                         35                          35p

   40-50                        10                        45                          450

  Total                      \sum f=p + 80∑f=p+80 \sum fx=35p + 1700∑fx=35p+1700

The mean of the data is given by,

M=\frac{\sum fx}{\sum f}M=∑f∑fx

24=\frac{35p+1700}{p+80}24=p+8035p+1700

24p+1920=35p+170024p+1920=35p+1700

35p-24p=1920-170035p−24p=1920−1700

11p=22011p=220

p=\frac{220}{11}p=11220

p=20p=20

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