For a unit test, a teacher prepared the following record of scores (out of 30) obtained by 28 students. Along with the usual frequency column, the teacher also wrote the cumulative frequencies.
Score (x) | 5 | 10 | 15 | 20 | 25 | 30
Frequency (f) | 2 | 4 | 6 | 8 | 5 | 3
Cumulative f | 2 | 6 | 12 | 20 | 25 | 28
(i) From the information given, state the lowest and the highest scores obtained in the test.
(ii) Determine the range of the test scores.