Martin gets a's (95100) on all of the writing assignments that he does, but he has skipped half of the writing assignments. in discussing his grades with a friend, he says "i must have a c in writing, because i have a's on half the assignments, and f's on the other half." but martin is worse off than he thinks. he actually has an f in writing. his grade is f because:
a) each student's highest and lowest score were dropped. b) the teacher assigned a zero for every missing assignment. c) the teacher used a system of scoring that is unreliable. d) the teacher was using absolute grading standards.