Please help me answer these questions. Thank you.

1. Suppose that an accounting rm does a study to determine the time needed to complete one person's tax forms. It randome surveys 100 people. The Sample mean is 23.6 hours. There is a known standard deviation of 7.0 hours. The population distribution is assumed to be normal. Construct a 90% condence interval for the population mean time to complete the tax forms. 2. A sample of 16 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 two ounces with a standard deviation of 0.12 ounces. The population standard deviation is known to be 0.1 ounce. Construct a 95% condence interval for the population mean weight of the candies