One criterion used to evaluate employees in the assembly section of a large factory is the number of defective pieces per 1,000 parts produced. The quality control department wants to find out whether there is a relationship between years of experience and defect rate. Since the job is repetitious, after the initial training period any improvement due to a learning effect might be offset by a loss of motivation. A defect rate is calculated for each worker in a yearly evaluation. The results for 100 workers are given in the table below.
Referring to Table 11-4, what is the expected number of employees with less than 1 year of training time and a high defect rate?
a) 4.17
b) 4.60
c) 5.28
d) 9.17