The heights (in cm) of 28 young saplings of a nursery are:
(a) 34, 38, 41, 36, 40, 42, 39, 37, 41, 43, 35, 38, 40, 39, 36, 42, 34, 38, 41, 37, 40, 43, 35, 39, 36, 42, 34, 38
(b) (i) Construct an ungrouped frequency distribution table showing each distinct height and its frequency.
(c) (ii) Extend the table by adding a column of relative frequencies correct to two decimal places.
(d) (iii) Using your table, calculate the percentage of saplings that are at least 40cm tall.