The following is the roster for a small upper-division biology class at a univer
ID: 2932192 • Letter: T
Question
The following is the roster for a small upper-division biology class at a university. The course is offered to both biology and non-biology majors. Each row represents the major, class standing, and course grade.
Student
Major
Class Standing
Grade
Cameron
Biology
Junior
A
Tamara
Biology
Junior
A
Jenny
Biology
Junior
A
Rachel
Biology
Junior
A
Lan
Other
Senior
A
Sam
Biology
Senior
B
Carlos
Biology
Senior
B
Jacob
Biology
Sophomore
B
Lamar
Biology
Sophomore
B
Heather
Other
Junior
B
Daniel
Other
Senior
B
Marcus
Other
Senior
B
Carrie
Biology
Junior
C
Sean
Other
Junior
C
Tina
Other
Junior
C
Robert
Biology
Senior
D
Tara
Other
Senior
D
Jeremy
Biology
Sophomore
F
Q3. (6 points) Of the students in the class the chance a randomly selected student is:
Round all probabilities to three decimal places.
a Biology major is: P(Biology Major) =
a senior is: P(Senior) =
a Biology major AND a Senior is: P(Biology AND Senior) =
Explain step by step as if you giving a solution to someone who does not know anything about probability how you came up with your answer for part c.
Student
Major
Class Standing
Grade
Cameron
Biology
Junior
A
Tamara
Biology
Junior
A
Jenny
Biology
Junior
A
Rachel
Biology
Junior
A
Lan
Other
Senior
A
Sam
Biology
Senior
B
Carlos
Biology
Senior
B
Jacob
Biology
Sophomore
B
Lamar
Biology
Sophomore
B
Heather
Other
Junior
B
Daniel
Other
Senior
B
Marcus
Other
Senior
B
Carrie
Biology
Junior
C
Sean
Other
Junior
C
Tina
Other
Junior
C
Robert
Biology
Senior
D
Tara
Other
Senior
D
Jeremy
Biology
Sophomore
F
Explanation / Answer
Answers with detailed explanations below:
a. P( biology major) = no. of people with bio major/total people = 13/13+7 = .650
b. P( senior) = no. of seniors/total people = 7/20 = .350
c. P( senior and bio major) = no. of people with bio major and senior/total people = 3/20 = .150
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