4. Scores of 10 randomly selected exams in a statistic class are given below: 98 78…

4. Scores of 10 randomly selected exams in a statistic class are given below: 98 78 90 70 80 55 78 77 70 80 (a) (4 points) Find the mean and standard deviation. Round your answer to a whole number. (a) It has been reported that the mean score of all statistics exams is greater than 75. Test the validity of the report at a = 0.02 by using the data given above. (b) (4 points) Clearly state H, and Hı, and identify the claim and type of test. HO: H: (e) (4 points) Find the computed test statistic and the p-value. C.T.S.: p -Value : (d) (2 points) Use non-statistical terminology to state your final conclusion about the claim.