For the life of me I cannot start this question to me this does not make sense?
In a certain school, it is know that 80% of the student’s user the internet for school projects 60%m use e-mail on regular basis, and 90% use the internet for school projects or for e-mail on a regular basis. A student from this school is selected at random. Determine the probability that the student used e-mail, given that the student used the internet for school projects
Would I go like this:
1/80 x 1/60 = 2.08 x 10^4 this does not make sense??????
Hello, superman!
Since when does ???In a certain school, 80% of the students use the internet,
60% use e-mail, and 90% use the internet or for e-mail.
A student from this school is selected at random.
Determine the probability that the student used e-mail,
given that the student used the internet.
Would I go like this: 1/80 x 1/60 = 2.08 x 10^4
This does not make sense . It certainly doesn't!
Since you are given a Conditional Probability problem,
I assume you know this formula: . .[1]
. . and Bayes' Theorem: . .[2]
We are given: .
Substitute into [1]: .
. . . .and we have: . . . .
. . . . . . . . Hence: .
We are asked for: .
Bayes' Theorem: .