Organise the following marks in a class assessment, in a tabular form.
4, 6, 7, 5, 3, 5, 4, 5, 2, 6, 2, 5, 1, 9, 6, 5, 8, 4, 6, 7
(i) Which number is the highest?
(ii) Which number is the lowest?
(iii) What is the range of the data?
(iv) Find the arithmetic mean.
|
Marks |
Tally marks |
Frequency |
|
1 |
|
1 |
|
2 |
|
2 |
|
3 |
|
1 |
|
4 |
|
3 |
|
5 |
|
5 |
|
6 |
|
4 |
|
7 |
|
2 |
|
8 |
|
1 |
|
9 |
|
1 |
(i) Highest number = 9
(ii) Lowest number = 1
(iii) Range = (9 − 1) = 8
(iv) Sum of all the observations = 4 + 6 + 7 + 5 + 3 + 5 + 4 + 5 + 2 + 6 + 2
+ 5 + 1 + 9 + 6 + 5 + 8 + 4 + 6 + 7
= 100
Total number of observations = 20
=