The heights (in cm) of 50 young saplings in a nursery are grouped as shown below, but one frequency is missing.
Class interval (cm): 10–15, 15–20, 20–25, 25–30, 30–35
Number of saplings: 4, 9, 14, x, 8
Work through the following tasks.
a. (i) Determine the value of x and write the completed frequency distribution table.
b. (ii) Draw a histogram for the completed data on graph paper, choosing a suitable scale for both axes.
c. (iii) From your histogram, identify the class interval containing the tallest group of saplings.