Question

The percentage of attendance of different classes in a year in a school is given below:

$\begin{array}{ccccccc}\text{Class}& X& IX& VIII& VII& VI& V\\ \text{Attendance}& 30& 62& 85& 92& 76& 55\end{array}$

What is the probability that the class attendance is more than 75%?

Answer 1

Percentage of attendance of different classes

$\begin{array}{ccccccc}\text{Class}& X& IX& VIII& VII& VI& V\\ \text{Attendance}& 30& 62& 85& 92& 76& 55\end{array}$

Number of classes with attendance more than 75% (m) = 3 (VIII, VII and VI) and total number of classes (n) = 6

$\therefore$ Required probability = $\frac{3}{6}=\frac{1}{2}$