A mathematics teacher noted the marks obtained (out of 10) by her 36 students in a weekly quiz. The data are shown in the following frequency table:
Marks (x) | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10
Frequency (f) | 1 | 2 | 3 | 4 | 5 | 6 | 5 | 4 | 3 | 2 | 1
a. (i) List the lowest and the highest marks that were awarded.
b. (ii) Calculate the range of the marks scored by the class.