Help with this statistics problem:

A study of systolic blood pressure of mid-level management personnel from a large company was conducted. A simple random sample of 30 individuals was selected. It was found that the average was with a standard deviation of s = 20, 95% Confidence level.

• What is the margin of error? answer to 1 decimal place
• What is the lower bound of the 95% confidence interval? answer to 1 decimal place
• What is the upper bound of the 95% confidence interval? answer to 1 decimal place
• How large of a sample is needed for a 99% confidence interval if we wish to limit the margin of error to no more than 5 for the mid-level management personnel in this company. Answer the following:

a) What is the appropriate z* value to use for a 99% confidence interval. Answer to 3 decimal places [z]

b) What sample size is need to limit the margin of error to 5? [n]