Use this information about 10 shipments of light bulbs: $\begin{array}{lcccccccccc}
\text { Shipment } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 \
\text { \# of defective units } & 0 & 1 & 2 & 0 & 4 & 3 & 2 & 1 & 3 & 4
\end{array}$

If 400 bulbs are selected at random from each of 10 shipments and the number of defectives in each shipment is given above,find the appropriate center line.
A).005
B).05
C).0025
D).01

Question

Use this information about 10 shipments of light bulbs: $\begin{array}{lcccccccccc}
\text { Shipment } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 \
\text { \# of defective units } & 0 & 1 & 2 & 0 & 4 & 3 & 2 & 1 & 3 & 4
\end{array}$

If 400 bulbs are selected at random from each of 10 shipments and the number of defectives in each shipment is given above,find the appropriate center line.
A).005
B).05
C).0025
D).01

Quizplus · Accepted Answer

The center line is the average number of defectives per shipment. The average number of defectives per shipment is 2.1. Therefore, the center line is 2.1/400 = 0.005.

Use This Information About 10 Shipments of Light Bulbs If 400 Bulbs Are Selected at Random from Each of