CSC107 - Lab 4
Collective Wisdom - Part 2
Assigned Jan 22
Due Jan 27 Beginning of Class
Show your work on all questions for full credit.
Majority Wisdom
Question 1
Three people answer the question "Which is taller on average, an ostrich or an emu?" If
each person is 70% correct when they answer questions like this, what is the
probability that the majority answer is correct?
Question 2
How many ways are there to choose 4 people from a class of 7?
Question 3
What is the probability that with 7 people voting, 5 are exactly right, given that each person is 70% correct?
Question 4
Nine people answer the question "Which has a higher average weight, an African or Asian elephant?"
If each person is 65% correct when the answer questions like this, what is
the probability that the majority answer is correct?
© Mark Goadrich, Centenary College of Louisiana