(a)The marks obtained by 20 pupils in a test were as follows:
$\table 4,8,7,6;2,1,7,4;3,7,6,4;7,5,2,7;5,4,8,3;$

(i)Construct a frequency distribution table for this data
(ii)What is the mode of the distribution?
(iii)Calculate the mean mark
(iv)What percentage of the pupils passed, if the pass mark is 6?
(v)What is the probability that a pupil selected at random scored not more than 5 marks?

(b) Simplify 7⅔ - 4⅚ + 2⅜