A teacher figures that final grades in the chemistry department are

     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