A retailer uses a control chart with the confidence level 95.45% to monitor the daily number of returns. The store receives an average of 8 returns per day. Based on this information, an investigation for possible anomalies is ______ if on a day 15 returns are received.

	not enough information
	not necessary
	necessary

At a production process, the operators inspect 90 units of outputs daily. The following table shows the number of defects found on 8 days.

	Day 1	Day 2	Day 3	Day 4	Day 5	Day 6	Day 7	Day 8
# of defects	2	0	5	8	1	4	2	5

For a 95.45% confidence level, what is the lower control limit of the control chart that monitors the daily number of defects?

1. Round your answer to 2 decimal places.
2. If your answer is negative, replace it by 0.