solve the problem quickly

Question A2 (a) The following table shows the times (in minutes) it takes of a sample of 20 students to complete an English assignment, arranged in ascending order. 43 62 67 71 80 89 96 109 111 117 120 122 124 131 135 142 151 152 158 176 Suppose a 6-class grouped frequency distribution is to be constructed for the above data set using the smallest value as the lower class limit of the first class. (i) Find the class width. (2 marks) (ii) Find the lower class limit of the 2nd class. (2 marks) (iii) Find the upper class boundary of the 3"d class. (2 marks)