Question

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

Class:	X	IX	VIII	VII	VI	V
Attendance:	30	62	85	92	76	55

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

Options

• `1/6`

• `1/3`

• `5/6`

• `1/2`

Answer 1

The total number of trials is 6.

Let A be the event that the attendance of a class is more than 75%.

The number of times A happens is 3 (for classes’ VIII, VII and VI).

Remember the empirical or experimental or observed frequency approach to probability.

If n be the total number of trials of an experiment and A is an event associated to it such that A happens in m-trials. Then the empirical probability of happening of event A is denoted by P(A) and is given by

P(A) = `m/n`

Therefore, we have

` P (A) = 3/6 `

          `=1/2`