please i need the full answer clearly for q4 and 5 and 6

4. Given angle repetitions of 123°42'58", 123°43'05", 123°43'08", 123°42'56", 123°42'22") 6 123°43′05”, 123°43′02", 123°43'04", 123°42'58" show why at 95% confidence you can justify elimination of one angle as an outlier (blunder). 5. In the previous problem, eliminate the outlier (blunder) from the angle observations. Then: a. Calculate the angle's most probable value; b. Calculate the angle's standard deviation; C. Calculate the angle's standard deviation of the mean; d. Explain why no more data needs to be eliminated at 95% confidence. 6. Given the angles in Problem #4: a. If outliers are checked instead against a confidence of 3S instead of 95%, is there justification in eliminating any of the 9 measurements? Why? b. Calculate the angle's most probable value; Calculate the angle's standard deviation; c. d. Calculate the angle's standard deviation of the mean.​