Scores of 10 randomly selected exams in a statistic class are given below: 98 78 90 70 80 55 78 77 70 80 (a) (6 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 75. Test the validity of the report at a = 0.02 by using the data given above. (b) (4 points) Clearly state Ho and H1, and identify the claim and type of test. Ho : H : (c) (4 points) Find the computed test statistic and the p -value. C.T.S. : p -Value : (d) (3 points) Use non-statistical terminology to state your final conclusion about the claim.