March 1, 2017

Homework Help: statistics

Posted by stats-help on Wednesday, January 23, 2008 at 10:57pm.

A group of applicants for a position consists of 8 people who are qualified and 7 whoa are not. If we select two people at random to be interviewed (obviously without replacement), find the probability that we get:
a. two qualified people
b. one qualified and one unqualified person (think about different ways this could happen).
c. At least ONE qualified person. Hint: Use the complement law.

for a)i got the answer 4/15. 8/15*7/14
for b) i got the same answer

for c) the prob of picking both unqualified is 7/15*6/14= 1/5 so using complement would mean that i would take 1-1/5 to get 4/5???

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