Statistics

Please answer the following questions. Each response should be at least 1 paragraph.
1.    How is statistics used to control quality in manufacturing operations? 
2.    Why should a manager be concerned about operation reports that reveal only the “average” of sample data?  Is there a danger in making decisions based on average data, only? Why or why not?
3.    How is the concept of “probability” used in making business decisions?
4.    Statistical process control techniques are often used in manufacturing operations. Why?