#1
A Teacher makes up a 5 question multiple choice test. Each question has 5 answers listed "a-e". A new student takes the test on his first day of class. He has no prior knowledge of the material being tested.

a) What is the probability he makes a 100 by purely guessing?


b)What is the probability he only misses 2 questions?


c)What is the probability he misses more than 2 questions?

And here are my answers

a) 5 nCr 5 * 1/5^5 * 4/5^0 = .00032

b) 5 nCr 3 * 1/5^3 * 4/5^2 = .0512

c) 5 nCr 2 * 1/5^2 * 4/5^3 + 5 nCr 1 * 1/5^1 * 4/5^3 + 5 nCr 0 * 1/5^0 * 4/5^5 = .94208


Did I do it right?
#4
Nope. The correct answer is - "Here's 5 bucks. Take the test for me."
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#5
Quote by Jackal58
Nope. The correct answer is - "Here's 5 bucks. Take the test for me."


Well said.
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#11
Why dont you fuck the teacher, cut her head open, and look for the answers there?


OF COURSE I WANT YOU TO GO GET THE ANSWER KEY!
#12
I think c is wrong it should be 1 - (C(5,5)(1/5)^5 + C(5, 4)(1/5)^4*4/5) = 1- 0.00672 = 0.99328