In a group of 800 people, 1/5 play at least one instrument, 64 play two or more. What is the probability that one student play exactly one instrument?	Choose the correct choice from the following answers:
A) 3/25
B) 3/125
C) C)2/25
D) 3/25
E) 1/5
P(playing 2 or more instruments) = 64/800 = 2/25.   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 - 2/25 = 3/25.   3/25nswer 3/25.
<result>A</result>
In a group of 800 people, 1/5 play at least one instrument, 64 play two or more. What is the probability that one student play exactly one instrument?