Cdf is a cumulative distribution function (f (x)), so it can be understood as the result of adding all PDFs (f (x f (x)) in a certain interval. So the result of their addition is 1. So the direct integral p(x) is cdf. F (x) = integral (f (x)) = integral (p (x)) =1.Then find C. Drawing is relatively simple. Remember that cdf is cumulative, so it is the sum of each p(x), that is, the value of the y axis. The third problem is that p (x ≥ 50) is the integral of PDF from 50 to infinity. You can also use 1-p (x

The second question is, I drew the cdf diagram for you, and the alpha was also worked out. As for the cdf formula, do it yourself. The picture came out, which is actually very simple.