Question

The first unit test of 40 marks was conducted for a class of 35 students. The marks obtained by the students were as follows. Find the mean of the marks.

40, 35, 30, 25, 23, 20, 14, 15, 16, 20, 17,

37, 37, 20, 36, 16, 30, 25, 25, 36, 37, 39,

39, 40, 15, 16, 17, 30, 16, 39, 40, 35, 37,

23, 16.

Answer 1

Here, we can add all observations, but it will be a tedious job. It is easy to make frequency distribution table to calculate mean.

= 27.31 marks (approximately) 

∴ The mean of the mark is 27.31.