At professional examination students were getting grades A, B, C, D and E in the ration of 1:3:4:5:7 In the last examination 900 students who took the revision block release classes, were graded as follows:
Grade
A
B
C
D
E
Number of Students
110
160
190
210
230
By testing the hypothesis, check if there is an improvement in student’s performance after taking revision block release classes at 0.05 level of significance and advice the examination board?
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