A quality control manager at a potato chip company uses the standard deviation in a production line as a measure of consistency. A bag of potato chips is intended to have a mean of 10 ounces, and the manager would like the standard deviation to be as low as possible. He gathers a random sample of 17 containers. Estimate the population standard deviation of the amount of chips at a 80% level of confidence.

10.05	10.02	9.94	10.16	9.87	9.96
10.03	10.03	10.05	10.04	10.06	10.01
10.08	9.94	9.88	10.09	9.97

We are 80% confident that the standard deviation of the amount of chips is between and . Round to 2 decimal places.