The distribution below shows the number of pages students read in a library session. One frequency is missing.
Class interval (pages): 0–10 10–20 20–30 30–40 40–50
Frequency: 6 x 14 10 4
If the mode of the distribution is 26 pages, answer the following.
(i) Identify the modal class and state its lower class boundary.
(ii) Find the missing frequency x that satisfies the given mode.
(iii) After inserting the value of x, comment on whether the distribution is unimodal or not, giving a suitable reason.