STAT 400 Midterm: STAT400 ALL-SECTIONS SPRING2012 0000 MID EXAM 1
15 Feb 2019
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April 23, 2012 stat 400 exam 2. You must show all appropriate work in order to receive full credit for an answer: before handing in your test: on your first answer sheet only, please copy the pledge and sign. Answer question 1 on answer page 1: (10 points) suppose that, from past experience, the math dept. knows that, on average, 80% of those who enroll in a calc i class pass (grade of c or better). The current enrollment in calc i is 400 students. Verify that this situation satisfies the rule of thumb for calculating probabilities using a normal approximation. Use a normal approximation to a binomial distribution to determine the probability that more than 340 of the current students pass calc i. (don"t forget the correction for continuity. ) Answer question 2 on answer page 2: (12 points) reliability studies use an exponential probability distribution to express the expected life time of a piece of machinery.
