An Insurance Company Auditor Takes Eight Samples of 250 Completed $\sigma$

An insurance company auditor takes eight samples of 250 completed forms to establish control limits for the fraction of insurance policy forms that are filled out incorrectly. The data appear in this table:

-Calculate $\sigma$ _P, the mean percent defective for all samples collected.

A) 0.0129
B) 10.875
C) 0.0435
D) 3.29
E) 0.00