A sample of 32 students received the following grades on an exam.

a. Does this sample show that the median score for the exam differs from 50? Use a = 0.05
b. Does this sample show that the median score for the exam is less than 50? Use a = 0.05.

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41 42 48 46 50 54 51 42 51 50 45 42 32 45 43 56 55 47 45 51 60 44 57 57 47 28 41 42 54 48 47 32