Question
Plot the point $A (2,-3), B (-1,2)$ and $C (0,-2)$ on the graph paper. Draw the triangle formed by reflecting these points in the $x$-axis. Are the two triangles congruent?
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| Ht. (cm) | 150 - 155 | 155 – 160 | 160 - 165 | 165 – 170 | 170 – 175 | 175 - 180 | 180 – 185 |
| No of workers: | 6 | 12 | 18 | 20 | 13 | 8 | 6 |
(i) Determine the cumulative frequencies.
(ii) Draw the ‘less than’ cumulative frequency curve on graph paper. Use 2 cm = 5 cm height on one axis and 2 cm = 10 workers on the other.
