1.A sample of 19 small bags of same brand Orange Slices was selected. Assume that the population distribution of bag weights is normal. The weight of each bag was recorded. The mean weight was 3 ounces with a standard deviation of 0.12 ounces. The population standard deviation is 0.1 ounces.

a) Find the associated z - score for a confidence level of 85%.

b)Find the margin of error for the population mean weight of the Orange Slices bags using a confidence level of 85%.

c)Find and interpret an 85% confidence interval for the mean weight of Orange Slices.