A teacher figures that final grades in the chemistry department are distributed as: A, 25%; B, 25%; C, 40%; D, 5%; F, 5% At the end of a randomly selected semester, the following number of grades were recorded. Find the critical value x 2/0 to determine if the grade distribution for the department is different than expected. Use α = 0.01 Grade A B C D F Number 42 36 60 14 8
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