The Student Room Group

Probability trees

I am stuck/ unsure for question 1. Below is my working and the question: have I done it wrong?
Reply 1
Original post by Alex-Torres
I am stuck/ unsure for question 1. Below is my working and the question: have I done it wrong?


So you know she succeeded.
from part ii) P(success) = 0.93
The question is asking you to find the probability of a success first time. So find the proportion of success first time, to the probability of success.
Reply 2
Original post by Alex-Torres
I am stuck/ unsure for question 1. Below is my working and the question: have I done it wrong?


No, that is fine

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