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 600 students who took the revision block release classes, were graded as...

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 600 students who took the revision block release classes, were graded as follows:

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?