TABLE 12-4
One Criterion Used to Evaluate Employees in the Assembly

TABLE 12-4
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.
$\quad$$\quad$ $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\text { Years Since Training Period }$
$\begin{array}{r|rcc} & <1 \text { Year } & 1-4 \text { Years } & 5 \text { - } 9 \text { Years } \\\hline \text { High } & 6 & 9 & 9 \\\text { Defect Rate: Average } & 9 & 19 & 23 \\\text { Low } & 7 & 8 & 10\end{array}$

-Referring to Table 12-4, what is the expected number of employees with less than 1 year of training time and a high defect rate?

A) 4.60
B) 9.17
C) 5.28
D) 4.17