Find mean,mode and median of following.
Marks: Less than 30,40,50,60,70,80,90 (All less than )
No of students: 5,12,25,30,34,38,40
The data can be represented in the form of a table as shown below:
From the table above we can see that the 20th observation lies in the class interval 40-50 so the median class is 40-50.
From the table it is clear that maximum frequency lies in the class interval 40-50. So, the modal class is 40-50.
Now, consider the formula,
From the table above we can see that the 20th observation lies in the class interval 40-50 so the median class is 40-50.
From the table it is clear that maximum frequency lies in the class interval 40-50. So, the modal class is 40-50.
Now, consider the formula,