The frequency distribution of scores obtained by 230 candidates in a medical entrance test is as follows:
Scores:    400-450             450-500                500-550             550-600                600-650             650-700                700-750             750-800 No. of Candidates             20                35         40         32                24         27         18                24
Draw cumulative frequency curves by less than and more than method on the same axes. Also, draw the two types of cumulative frequency polygons.