Question 870446: I keep getting different results every time I try to work this problem. Help please?
You are conducting a survey at a college with 800 students, 50 faculty members,
and 150 administrators. Each of these 1,000 individuals has a single listing in
the campus phone directory. Suppose you were to cut up the directory and pull
out one listing at random to contact. What is the probability it would be (a) a student,
(b) a faculty member, (c) an administrator, (d) a faculty member or administrator,
and (e) anyone except an administrator? (f) Explain your answers to
someone who has never had a course in statistics.
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website! 1000 Ind: 800S, 50F, 150A
pull out one listing at random to contact
a) P(S) = 800/1000 = 4/5 = .8 0r 80%
b) P(A) = 150/1000 = 15/100 = 3/20 = .15 0r 15%
c) P(F 0r A)= 50/1000 + 3/20 = 1/20 + 3/20 = 4/20 = 1/5 0r 20%
d) P(S + F) = 850/1000 = 85/100 = 17/20 = .85 0r 85%
the more of the entire population the classification is...the larger the %
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