HW#1-ying- A difficult problem in my field- Statistics

Statistics is the Science which of collecting, organizing, presenting, analyzing and interpreting data to make more available decisions. There are a lot of controversy issues in this field, but the basic of these problems is that between the vary and constant. Let me give you a example, when you toss a coin, there are two outcomes, heads and tails, you have no idea what outcome would be next, so the outcome here is variable, but when you toss the coin more than thousands times, the percentages of heads and tails would be constant. That's one of the difficult problems and it is also the basic problems that people in statistics field would deal with.