Question

Given below are the marks obtained by 27 students in a test :
21, 3, 28, 38, 6, 40, 20, 26,9, 8, 14, 18, 20, 16, 17, 10,8,5, 22, 27, 34, 2, 35, 31, 16, 28, 37.Using the class intervals 1 - 10, 11 - 20 etc. construct a frequency table.
(ii) State the range of these marks.
(iii) State the class mark of the third class of your frequency table.

Answer 1

Answer:

First, we will arrange the data in increasing order.

3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 7, 7

Frequency table of the above data:

 

Number of membersTally marksNumber of families (frequency)3||||||||44||||||||45|||||||| ||||76||||||37||||2Total 20