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 absents per day.

Given:

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

To do:

We have to find the mean number of students absents per day.

Solution:

Let the assumed mean be $A=3$

 We know that,

Mean $=A+\frac{\sum{f_id_i}}{\sum{f_i}}$  

Therefore, 

Mean $=3+\frac{63}{120}$

$=3+0.525$

$=3.525$

The mean number of students per day is $3.53$.

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Updated on: 10-Oct-2022

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