Medal!
Arthur is testing the effectiveness of a new acne medication. There are one hundred people with
acne in the study. Forty patients received the acne medication and sixty other patients did not receive
treatment. Fifteen of the patients who received the medication reported clearer skin at the end of the
study. Twenty of the patients who did not receive medication reported clearer skin at the end of the
study. What is the probability that a patient chosen at random from this study took the medication,
given that he or she reported clearer skin? (5 points)
15%
33%
38%
43%

Question

Medal!
Arthur is testing the effectiveness of a new acne medication. There are one hundred people with
acne in the study. Forty patients received the acne medication and sixty other patients did not receive
treatment. Fifteen of the patients who received the medication reported clearer skin at the end of the
study. Twenty of the patients who did not receive medication reported clearer skin at the end of the
study. What is the probability that a patient chosen at random from this study took the medication,
given that he or she reported clearer skin? (5 points)
15%
33%
38%
43%

anonymous · Answer

okay u have to calculate two probilabilties .. one for who are given medicine and reported clear and the other who were not given medi and reported clear.. and then u have to add these probilbalities will give u the answer

anonymous · Answer

15/40 (the probibality for reported clear and recived madi )+20/60(the probibality for reported clear and did`t reccieve madi)
=(15/40)+(20/60)