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Solve Any Two of the Following. Find the Mean of the Data Given in the Following Table. - Algebra

Solve any two of the following. 

Find the mean of the data given in the following table. 

Class 0-20 20-40 40-60 60-80 80-100
Frequency  6 4 5 7 3
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Solution

Class

Class

Mark` (x_1)`

Frequency 

`f_1`

`x_1f_1` 
0-20 10 6 60
20-40 30 4 120
40-60 50 5 250
60-80 70 7 490
80-100 90 3 270
    25 1190

Mean=`(∑x_1f_1)/(∑f_1)` 

=`1190/25` 

=`47.6`

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