(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.