In a group of 800 people, 1/5 play at least one instrument, 32 play two or more. What is the probability that one student play exactly one instrument?	Select the correct option: A) 2/125 B) 4/25 C) C)2/25 D) 3/25 E) 1/5
P(playing 2 or more instruments) = 32/800 = 1/25.   Then, the probability of playing exactly one instrument is given by:   P(playing 1 or more instruments) - P(playing 2 or more instruments) = 1/5 - 1/25 = 4/25.   Answer 4/25.
<result>B</result>
In a group of 800 people, 1/5 play at least one instrument, 32 play two or more. What is the probability that one student play exactly one instrument?