In a group of 800 people, 2/5 play at least one instrument, 96 play two or more. What is the probability that one student play exactly one instrument? Select.
A) 2/125	B) 3/125	C) C)2/25	D) 3/25	E) 7/25
P(playing 2 or more instruments) = 96/800 = 3/25.   Then, the probability of playing exactly one instrument is given by:   P(playing 1 or more instruments) - P(playing 2 or more instruments) = 2/5 - 3/25 = 7/25.   Answer 7/25.
<result>E</result>
In a group of 800 people, 2/5 play at least one instrument, 96 play two or more. What is the probability that one student play exactly one instrument?