Please find the variance in que 16. My ans is not matching
height(in cm) | No.of students fi | xi | fiui | ui2 | fiui2 | |
136-140 | 3 | 138 | -4 | -12 | 16 | 48 |
140-144 | 8 | 142 | -3 | -24 | 9 | 72 |
144-148 | 15 | 146 | -2 | -30 | 4 | 60 |
148-152 | 19 | 150 | -1 | -19 | 1 | 19 |
152-156 | 35 | 154 | 0 | 0 | 0 | 0 |
156-160 | 27 | 158 | 1 | 27 | 1 | 27 |
160-164 | 20 | 162 | 2 | 40 | 4 | 80 |
164-168 | 9 | 166 | 3 | 27 | 9 | 81 |
168-172 | 4 | 170 | 4 | 16 | 16 | 64 |