2. Normal and exponential distributions fit poorly
Weibull and lognormal distributions are better, but not great.
For final part possible answers are 0.1287 (Weibull) or 0.0934 (lognormal).
3. alpha=248.218, beta=68.0131
(i) 701.12
(ii) 652.17
Using the fundamental formula we get (i) 701.17 and (ii) 652.25.