Question

Given the data below are the number of students in each age group.
Ages Number of students
15-18 9
19-22 8
23-26 2
27-30 5
31-34 7
35-38 3

Based on the frequency distribution above, find the cumulative frequency for the class with lower class limit 31.

Answer 1

A scale of 1:50 000 means that every centimetre on the map is equal to 50 000 centimetres (500 metres) in reality.

The distance between two towns on that map is 6cm, therefore in reality there’s 6 * 50 000 = 300 000 centimetres, which is equal to 3 000 metres, which is equal to 3 kilometres.