(a)

suppose the median is k. The definition of a median means that

Use the cdf and set its value to 0.5.

solve for k.

(b) the graph looks like this

http://www.wolframalpha.com/input/?i=plot+0.02e^%28-0.02x%29%2C+x%3D0...100

(it extends to infinity, but i've only showed up to x=100)

(c) use the cdf to find

post your attempt to at least part of (d) and (e) if you need help on those.