If grading times are independent and the instructor begins grading at 6:50 P.M. and grades continuously

There are 40 students in an elementary statistics class. On the basis of years of experience, the instructor knows that the time needed to grade a randomly chosen first examination paper is a random variable with an expected value of 6 min and a standard deviation of 6 min.

a. If grading times are independent and the instructor begins grading at 6:50 P.M. and grades continuously, what is the (approximate) probability that he is through grading before the 11:00 P.M. TV news begins?

b. If the sports report begins at 11:10, what is the probability that he misses part of the report if he waits until grading is done before turning on the TV

Solutions

Expert Solution

milcah answered 2 years ago

Next > < Previous

Related Solutions

An instructor grades exams, 20%; term paper, 30%; final exam, 50%. A student had grades of...

An instructor grades exams, 20%; term paper, 30%; final exam, 50%. A student had grades of 83, 72, and 90, respectively, for exams, term paper, and final exam. Find the student’s final average. Use the weighted mean. Stories in the Tallest Buildings The number of stories in the 13 tallest buildings for two different cities is listed below. Which set of data is more variable? Houston: 75, 71, 64, 56, 53, 55, 47, 55, 52, 50, 50, 50, 47 Pittsburgh:...

1a) Let S = $55, K = $50, r = 6% (continuously compounded), d = 2%,...

1a) Let S = $55, K = $50, r = 6% (continuously compounded), d = 2%, s = 40%, T = 0.5, and n = 5. In this situation, the appropriate values of u and d are 1.13939 and 0.88471, respectively. What is the value of p*, the risk-neutral probability of an upward movement in the stock price at any node of the binomial tree? Answers: a. 0.5316 b. 0.4998 c. 0.3738 d. 0.4146 e. 0.4684 1b) Let S =...

A die is rolled 50 times and the following are the outputs: 6 1 3 4...

A die is rolled 50 times and the following are the outputs: 6 1 3 4 2 6 3 5 1 3 6 1 6 6 3 3 6 5 2 4 1 6 5 3 1 2 5 2 1 2 4 1 4 1 5 5 6 6 2 1 1 2 5 6 5 5 6 3 1 3 What is the p-value of the chi-square test that the die is unbiased?

Subjects