the option for the drop down is known or unknown

A sample of 11 small bags of the same brand of candies was selected. Assume that the population distribution of bag weights is normal. The weight of each bag was then recorded. The mean weight was 2 ounces with a standard deviation of 0.15 ounces. The population standard deviation is known to be 0.1 ounce. (Round answers to two decimals if needed. Given that the sample size n is and the sample mean x is . The population standard deviation o is known The 95% confidence interval for the population mean weight of the candies is ( )