Question 53

The data given below shows the marks obtained by various students.

What is the mean marks (Correct up to two decimal places) of given data?

Solution

To find the mean of the class interval , mid point of class interval of marks is obtained as shown in the table

Then product of marks and no of students is obtained

Total number of students = 30

$$\sum$$(marks $$\times no of students $$) = 66+104+75+119+76 = 440

mean = $$\frac{\sum(marks \times no. students)}{total students}$$ = $$\frac{440}{30}$$

= 14.67

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