Question

The double bar graph below shows the marks obtained by some students in two of their class tests.

Find the average marks scored by the students in the first test.

• A. 55 marks
• B. 60 marks
• C. 70 marks
• D. 75 marks

Answer 1

The correct option is A 55 marks

From the given double bar graph, the marks obtained by students in first test are 50, 45, 60, 65 and 55.
$\text{Mean}=\frac{\text{Sum of observations}}{\text{Number of observations}}$
Therefore, the mean of the marks obtained in the first test is:
$\text{Mean}=\frac{50+45+60+65+55}{5}=55$