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The Following Table Givens the Age of 50 Student of a Class . Find the Arithmetic Mean of Thier Agges. - Mathematics

The following table givens the age of 50 student of a class . find the arithmetic mean of thier agges. 

Age- Years 16-18 18-20 20-22 22-24 24-26
No.of students  2 7 21 17 3
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Solution

 

Age in years C.I `X_i` Number of student  (`f_i`)    `x_i f_i` 
16-18 17 2 34
18-20 19 7 133
20-22 21 21 441
22-24 23 17 391
24-26 25 3 75
Total   50 1074

`barx=f_ix_i/(∑ f)=1074/50=21.48` 

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APPEARS IN

Selina Concise Maths Class 10 ICSE
Chapter 24 Measure of Central Tendency(Mean, Median, Quartiles and Mode)
Exercise 24 (B) | Q 1 | Page 362
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