先介绍自己现在正在做的project，解决什么问题，建了什么model？怎么approach的？接下来4个问题。
1.How to verify whether x, y, z follow multivariate normal distributionwith known population mean and covariance?
How to check whether it’s randomly sampled?
2.Ads 2nd price option—winner paid second price. You and I arebidding.
My bidding price is unknown to you, but your bidding price and outcomeis available to you. Also know that my bidding price follows exponential distributionwith parameter lambda, ask how to estimate lambda in my bidding price.
3.N people has coordinate (xi, yi), they want to meet together at oneplace. Q: What is the meeting place?
4.Y is count, positive data, compare using linear regression model andregression with log link.