Problema Solution
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 provided by our tutors
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,------800/1000 = 0.8
(b) a faculty member,------50/1000 = 1/20
(c) an administrative staff member,-----150/1000 = 0.15
(d) a faculty or administrative staff member,----(50+150)/1000 = 1/5((e) anyone except an administrative staff member?-----(1000-150)/1000 = 850/1000= 0.85
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Probability = (# of ways to succeed)/(# of ways to succeed + # of ways to fail)