Answer:
The average defective rate  = .057
Step-by-step explanation:
Given -
Sample size n = 100
Day   -     1  2  3  4  5  6  7  8  9  10
Defectives - Â 7 Â 6 Â 6 Â 9 Â 5 Â 6 Â 0 Â 8 Â 9 Â 1
The average defective rate is the no of defective in each day for past ten days
The average defective rate  =  [tex]\frac{\sum no\; of \; effective \; in\; each\; day}{no\; of \; day \times n}[/tex]
                        = [tex]\frac{7 + 6 + 6 + 9 + 5 + 6 + 0 + 8 + 9 + 1}{10\times 100}[/tex]
                        = [tex]\frac{57}{1000}[/tex]
                        = .057
