9a) At Statistics High School, all classes have exactly 10 students. The probability that a single student fails a class is 0.03, independent of all other students and classes. In a randomly selected class, find the probability that at least three students fail that class. Solution? Let X be the number of failing students in a class. X~B(10,.03) Using normalcdf, we find the probability is approximately 0.002765

College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter9: Counting And Probability
Section9.3: Binomial Probability
Problem 2E: If a binomial experiment has probability p success, then the probability of failure is...
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9a) At Statistics High School, all classes have exactly 10 students. The probability that a single student fails a class
is 0.03, independent of all other students and classes. In a randomly selected class, find the probability that at least
three students fail that class.
Solution?
Let X be the number of failing students in a class.
X-B(10,.03)
Using normalcdf, we find the probability is approximately 0.002765
9b) The principal at Statistics High School follows this procedure to check the quality of their teachers: A class of
10 students is selected randomly. If the class contains at least three failing students, then another class taught by
that teacher is selected. If that class contains at least three failing students, then the teacher must have a meeting
with the academic dean; otherwise, the teacher's record is cleared. Assuming that each teacher's classes are
independent of each other, find the probability that a teacher must have a meeting with the academic dean.
Solution? (Note: the answer from 9a is used. Assume that it is correct in your analysis of this problem.)
P([2 3 fail in the first] n [2 3 fail in the second]) = P(2 3 fail in the first) x P(2 3 fail in the second)
The probability of at least three students failing in any given class is the same, approximately 0.002765
The overall probability is therefore approximately (0.002765)² × 0.00000765
Transcribed Image Text:9a) At Statistics High School, all classes have exactly 10 students. The probability that a single student fails a class is 0.03, independent of all other students and classes. In a randomly selected class, find the probability that at least three students fail that class. Solution? Let X be the number of failing students in a class. X-B(10,.03) Using normalcdf, we find the probability is approximately 0.002765 9b) The principal at Statistics High School follows this procedure to check the quality of their teachers: A class of 10 students is selected randomly. If the class contains at least three failing students, then another class taught by that teacher is selected. If that class contains at least three failing students, then the teacher must have a meeting with the academic dean; otherwise, the teacher's record is cleared. Assuming that each teacher's classes are independent of each other, find the probability that a teacher must have a meeting with the academic dean. Solution? (Note: the answer from 9a is used. Assume that it is correct in your analysis of this problem.) P([2 3 fail in the first] n [2 3 fail in the second]) = P(2 3 fail in the first) x P(2 3 fail in the second) The probability of at least three students failing in any given class is the same, approximately 0.002765 The overall probability is therefore approximately (0.002765)² × 0.00000765
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