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 second test.

• A. 66
• B. 55
• C. 60
• D. 75

Answer 1

The correct option is A 66

From the given double bar graph,
the marks obtained by students in second test are
65, 50, 70, 80 and 65.

$\text{Mean}=\frac{\text{Sum of observations}}{\text{Number of observations}}$

Therefore, the mean of the marks obtained in the second test is:

$\text{Mean}=\frac{65+50+70+80+65}{5}=\frac{330}{5}=66$