This is a Bayes Theorem Problem
P(oil | negative test) P(negative test)= P(negative test | oil) P(oil)
P(oil | negative test) = P(negative test | oil) P(oil) / P(negative test)
P(oil | negative test) =P(negative test | oil) P(oil) / ( P(negative test | oil) P(oil) + P(negative test | no oil) P(no oil) )
We're given the prior probability of oil, P(oil)=.45, so P(no oil)=.55
We given P(negative test | no oil) = 0.80, so P(negative test | oil) = .20

Choice A
All you've got to do is multiply both 13 and 20 by 5 so the fractions would be 65/100. Since you're trying to convert it into a decimal, you would move the decimal point 2 units to the right. This will result in the answer : 0.65.
Changing 13/20 would be 0.65
Answer:
the answe is 100.53088
Step-by-step explanation:
You multiply 3.14159 or pi by the 32, which is the answer, and it gives you 100.53088
Answer:
It would be 6 because 20 divided by 10 is 2 so you multiply 3 by 2
Step-by-step explanation: