1. The number of defects that appear in each roll of fabric produced in a factory is summarized by the frequencies with which they appear in the table:

Defects	Frequency
0	32
1	20
2	12
3	6
4	5
5	3
6	2

a) What is the average number of defects in this production? b) Find measures for the dispersion of defects: variance and standard deviation. c) If for each defect this company loses $25, calculate the expected loss caused by the defects in the fabrics.