NAME:
If a random person is given a medicine and has arthritis A there is a 0.72 probability of having a side
effect S from the medicine. The tree diagram shows probabilities of the medicine and its side effects if
the patient does or does not have arthritis.
0.72
S
0.8
0.2
A
not A
0.28
0.43
not S
S
A = arthritis
not A no arthritis
S = side effect
not S= no side effect
0.57
not S
What is the probability that a random person given the medicine has a side effect?
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