Class : 10
Sub : Maths
Ch : Statistics
Pls solve as soon as possible
Answers
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