Answer:
0.6768
Step-by-step explanation:
It says what is the probability student doesn't have lice GIVEN THAT student tested negative.
We need to look at the tree branch that has "student has no lice" and "test shows negative".
Looking at the bottom-most branch, we see this one shows that "test is negative and student has no lice". This has a value of 0.6768. This is the correct answer.
