Grade distribution: A statistics teacher claims that, on the average, 20% of her students get a grade of A, 35% get a B, 25% get a C, 10% get a D, and 10% get an F. The grades of a random sample of 100 students were recorded. The following table presents the results. Grade A B C D F Observed 29 42 20 5 4 Test the hypothesis that the grades follow the distribution claimed by the teacher. Use the 0.05 level of significance.

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