SOLUTION: It is known that 15% of all people have pets. If 15 people are selected at random, what is the probability that exactly four people will have pets?
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Question 962392: It is known that 15% of all people have pets. If 15 people are selected at random, what is the probability that exactly four people will have pets? Answer by jjthomson83(4) (Show Source):
You can put this solution on YOUR website! Using nCrP^(n-r)q^r
n=15, r=4, P=100%-15%=0.85, (n-r)=15-4=11 and q=15%=0.15
15C4×(0.85)^11×(0.15)^4
=0.1156 to four significant figures.
