Page 3 of 4 154 171 173 164 154 186 173 151 Bob measured the heights of all his cousins. The heights are rounded to the nearest centimetre. 175 166 138 161 165 188 139 137 144 154 186 191 164 174 154 138 156 146 176 191 177 151 a) Complete the frequency b) table for the data. Determine the approximate mean height of Bob's cousins by only using the grouped data in the frequency table from part a). Show your work (no spreadsheet). Interval (cm) Frequency 131 140 141-150 151-160 161-170 171 180 181-190 191-200