(a) The distribution of junior workers in an institution is as follows: Clerks - 78, Drivers - 36, Typists - 44, Messengers - 52, Others - 30. Represent the above information by a pie chart. (b) The table below shows the frequency distribution of marks scored by 30 candidates in an aptitude test.
Marks
4
5
6
7
8
9
No of candidates
5
8
5
6
4
2
Find the mean score to the nearest whole number.
Explanation
(a) Sector angle represented by the officers: Total number of officers = 240 Clerks = Drivers = Typists = Messengers = Others =
(b)
Marks (x)
4
5
6
7
8
9
Total
No of candidates (f)
5
8
5
6
4
2
30
20
40
30
42
32
18
182
Mean score = = = marks 6 marks to the nearest whole number.
