The table below shows the number of eggs laid by the chickens in a man's farm in a year.

No of eggs per year	No of chickens
45 - 49	10
50 - 54	36
55 - 59	64
60 - 64	52
65 - 69	28
70 - 74	10

(a) Draw a cumulative frequency curve for the distribution.

(b) Use your graph to find the interquartile range.

(c) If a woman buys a chicken from the farm, what is the probability that the chicken lays at least 60 eggs in a year?