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The following scores represent the final examination grades for an elementary statistics course: 33 60 79 32 57 74 52 70 82 80 77 81 95 41 65 92 85 55 THE 52 64 75 78 35 80 98 81 1 67 (a) Determine the 1stand 3rd quartiles. (b) If the criterion for passing is that the student's grade must be higher than the 65th percentile, how many students have failed the exam? (c) Determine the mean score excluding grades lower than the 25th percentile and higher than the 75th percentile