Need help with the following questions

QUESTION 3 You are told that a 95% condence interval for the mean weekly revenue for a small newsagent is ($2064, $2897). Then what was the sample mean from the data collected? O a. $24805 O b. 52460.5 0 c. We can't calculate this without knowing the sample size of the survey. O d. 52500.5 QUESTION 4 In the above question what is the value of the standard error of the mean (assume you do not know the population variance). O a. $416.5 O b. $212.50 O c. We can't calculate this without knowing the sample size of the survey O d. $208.25QUESTION 5 If we plan to calculate a 95% confidence interval and want to make sure we estimate the mean to within 1 unit when the variance is 64, then what minimum sample size is required. O a. 892 O b. 2166 O c. 15736 O d. 246