Question

The number of students absent in a class were recorded every day for 120 days and the information is given in the following frequency table:

No. of students absent (x):	0	1	2	3	4	5	6	7
No. of days (f):	1	4	10	50	34	15	4	2

Find the mean number of students absent per day.

Answer 1

Let the assume mean be.

We know that mean,

Now, we have .

Putting the values in the above formula,

Hence, the mean number of students absent per day is approximately 3.53.