Refer to Table S6.1 - Factors for Computing Control Chart Limits (3 sigma)

for this problem.

A process that is considered to be in control measures an ingredient in ounces. Below are the last 10 samples (each of size n = 5) taken. The population process standard deviation is

1.20.

Samples
1	2	3	4	5	6	7	8	9	10
9	13	12	10	13	11	10	12	9	10
9	11	8	10	9	11	12	15	7	13
11	13	11	10	10	7	11	7	11	10
10	13	10	11	11	13	9	10	11	9
12	12	10	11	9	9	8	7	10	12

Part 2

a) Standard deviation of the sampling means =

enter your response here

ounces (round your response to three decimal places).