Hi, sir.
Your problems are really easy, so I solved almost your problems as soon as I read your whole text.
(In fact, my group has 2 excellent probability&statistics experts.)
If you hire me, you'll be received the answer paper in 20 hours.
Besides, the price is very cheap, isn't it?
But if you want, I'll send the answer paper for no charges.
In that case, if you write good review for me on this site, then I'll be satisfied.
OK?
All depends on you, and I'm always ready for you except my business time.
Best regards, Thank you.