Sample mean, confident interval

We have collected a sample of size n = 6. We assume that the sample observations are independent, random draws from a Normal distribution. The sample is 536556 [hint: the sample standard deviation is 1.095] a (2 points) Compute the sample mean. b (4 points) Compute an exact 90% confidence interval for u. c (4 points) Conduct the following hypothesis test Hope5.8 H, :u