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An English Professor has a grading scheme designed so that at the end of the semester, 20% of the course enrollment will, on average, get

An English Professor has a grading scheme designed so that at the end of the semester, 20% of the course enrollment will, on average, get an A. The course enrollment is 119, and at the end of the semester 15 students get an A. What is the Observed value for an A, in the chi-square distribution?

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