The table shows the scores of 2000 candidates in an entrance examination into a private secondary school.



% Mark
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90



No of
pupils

68
184
294
402
480
310
164
98



(a) Prepare a cumulative frequency table and draw the cumulative frequency curve for the distribution.~(b) Use your curve to estimate the : (i) cut off mark, if 300 candidates are to be offered admission ; (ii) probability that a candidate picked at random, scored at least 45%.



The table shows the scores of 2000 candidates in an entrance examination into a private secondary school.



% Mark
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90



No of
pupils

68
184
294
402
480
310
164
98
