need the help on this question

A sample of 27 blue jellybeans with a mean weight of 0.8540 g was taken. Assume that o is known to be 0.0565 g. Consider a hypothesis test that uses a 0.05 signicance level to test the claim that the mean weight of all jellybeans is equal to 0.8505 g (the weight necessary so that bags of jellybeans have the weight printed on the package). Assume the weight of jellybeans is normally distributed. (a) What is the test statistic? Z: .32 (Round to two decimal places as needed.) (b) What are the critical values? Z: (Round to two decimal places as needed. Use a comma to separate answers as needed.)