i need help with these 4 questions so please help it would be greatly appreciated!!!!!!!

Questions 17-19 are related to the following A recent article in a business journal reported that the mean annual salary for graduates from 30 top 17 What is the probability that a random sample of n = 40 graduates will provide a sample mean a 0.8530 b 0.8198 c 0.7924 d 0.7698 18 What is the middle interval that captures 95% of the mean salaries from samples of size 40 a $233,603 $274,397 b $238,505 $269,495 c $241.03 5 $266,965 d $243,381 $264,119 19 Keep the error probability at a = 0.05. We want to build an interval which captures 95% of the a 107 b 97 c 87 d 77 20 The population of orders for printing jobs at a print shop is approximately normal with a mean a 0.9 591 0.9641 0.9778 0.9875 D-D&quot