minutes per week in the resource room. At the end of the semester the students in the class were asked how many minutes per week they spent in the resource room and whether they passed or failed. The passing rates are summarized in the following table: "ime spent in resource room Hone Pass% 27 Between 1 and 90 minutes 42 More than 90 minutes 75

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter2: Systems Of Linear Equations
Section2.4: Applications
Problem 28EQ
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a. What is the probability that a randomly selected student passes the course?
b. If a randomly selected student passed the course, what is the probability that
he or she studies more than 90 minutes in the resource room?
c. What is the probability that a randomly selected student does not pass the
course?
d. If a randomly chosen student did not pass the course, what is the probability
that he or she did not study in the resource room?
5B. Hint for solution, for independent events A and B
P(AnB) - P() x P(B) - (1-P(Α)) x (1-P(Β)
To find P(A U B)
P(ĀNB) = P(A U B) = 1– P(A U B)
Р(AU B) %3D 1- [(1— Р(4)} x (1 — Р(В)}]
Transcribed Image Text:a. What is the probability that a randomly selected student passes the course? b. If a randomly selected student passed the course, what is the probability that he or she studies more than 90 minutes in the resource room? c. What is the probability that a randomly selected student does not pass the course? d. If a randomly chosen student did not pass the course, what is the probability that he or she did not study in the resource room? 5B. Hint for solution, for independent events A and B P(AnB) - P() x P(B) - (1-P(Α)) x (1-P(Β) To find P(A U B) P(ĀNB) = P(A U B) = 1– P(A U B) Р(AU B) %3D 1- [(1— Р(4)} x (1 — Р(В)}]
Q.5
5A. On average 62 % of Finite Mathematics students spend some time in the
Mathematics Department's resource room. Half of these students spend more than 90
minutes per week in the resource room. At the end of the semester the students in the
class were asked how many minutes per week they spent in the resource room and
whether they passed or failed. The passing rates are summarized in the following
table:
Time spent in resource room
Pass%
None
27
Between 1 and 90 minutes
42
More than 90 minutes
75
Transcribed Image Text:Q.5 5A. On average 62 % of Finite Mathematics students spend some time in the Mathematics Department's resource room. Half of these students spend more than 90 minutes per week in the resource room. At the end of the semester the students in the class were asked how many minutes per week they spent in the resource room and whether they passed or failed. The passing rates are summarized in the following table: Time spent in resource room Pass% None 27 Between 1 and 90 minutes 42 More than 90 minutes 75
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