Math, asked by asifhussain82, 9 months ago

By short cut method, find the average marks of a student from the following table :
Marks obtained Below 10 Below 20 Below 30 Below 40 Below 50 Below do
No. of students | 25 40 60 T 75, | 80 | 85​

Answers

Answered by amitnrw
2

Given :  Marks obtained by students

To find : Average Marks

Solution:

                    cf              Class         f         Class Mean         f*Class mean

Below 10      25            0  - 10        25           5                     125

Below 20      40           10  - 20       15          15                    225

Below 30       60          20  - 30      20          25                   500

Below 40       75          30  - 40       15          35                    525

Below 50       80          40  - 50       5           45                    225

Below 60       85          50  - 60       5           55                    275

                                                         85                                 1875

Mean = 1875/85

= 22.06

Average Marks of students = 22

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