Question: 5. When Professor Wagoner teaches calculus, he only grades 25% of the students exam papers, randomly selected. The remaining papers are graded by his teaching

5. When Professor Wagoner teaches calculus, he only grades 25% of the students’ exam papers, randomly selected. The remaining papers are graded by his teaching assistants

(TA’s). Suppose that 78% of the papers graded by Professor Wagoner and 86% of the papers graded by the TA’s get a passing grade. If Harris, a calculus student of Professor Wagoner, got a passing grade on his last exam, what is the probability that his exam paper was graded by a TA?

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