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The Age of 40 Students Are Given in the Following Table : - Mathematics

Sum

The age of 40 students are given in the following table : 

 Age (in yrs)  12  13 14 15 16 17 18
 Frequency 2 4 6 9 8 7 4    

Find the Arithmetic mean.

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Solution

   Age in yrs `x_i`      Frequency `(f_i)`    `F_i X_i`
12 2 24
13 4 52
14 6 84
15 9 135
16 8 128
17 7 119
18 4 72
 Total 40 614

`barx=f_ix_i/(Σ f) =614/40=15.35`  

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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 (A) | Q 7 | Page 356
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