Problem: The marks of 5 students are: 60, 70, 80, 90, 100. Find the mean.
Solution: Mean=Sum of marksNumber of students\text{Mean} = \frac{\text{Sum of marks}}{\text{Number of students}}Mean=Number of studentsSum of marks =60+70+80+90+1005=4005=80= \frac{60+70+80+90+100}{5} = \frac{400}{5} = 80=560+70+80+90+100=5400=80
Mean = 80
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