Question

Maryann is testing the effectiveness of a new acne medication. There are 100 people with acne in the study. Fifty-five patients received the acne medication, and 45 other patients did not receive treatment. Thirty of the patients who received the medication reported clearer skin at the end of the study. Twenty-two 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 they reported clearer skin?

55%

58%

38%

43%

Answer 1

how many people reported clearer skin?

Answer 2

(number of people who took medication and reported clearer skin)
------------------------ divided by -----------------------
(total number of people who reported clearer skin)

Answer 3

@amistre64 i did that and got 15 over 11

Answer 4

30 out of (30+22)

30/52 is a percentage

Answer 5

i did what u said in the post above mine

Answer 6

i divided

Answer 7

did you divide 30 by 52?

Answer 8

i see what i did wrong

Answer 9

so i need to divide 30/52? 15/26

Answer 10

you are looking for a decimal, but yes. you need to divide 30 by 52

30+22 people are in the sample space (given they reported clearer skin)

and 30 out of that set took the meds.

Answer 11

.579 so 58%

Answer 12

58% is looking good to me yes

Answer 13

gotcha thx!

Answer 14

yw