SOLUTION: Please Please Please Help! Research has shown that, in the US, there is a .9 probability that a dollar bill is tainted with traces of cocaine. If we randomly select 6 dollar bills

Algebra ->  Probability-and-statistics -> SOLUTION: Please Please Please Help! Research has shown that, in the US, there is a .9 probability that a dollar bill is tainted with traces of cocaine. If we randomly select 6 dollar bills      Log On


   

Question 1025363: Please Please Please Help!
Research has shown that, in the US, there is a .9 probability that a dollar bill is tainted with traces of cocaine. If we randomly select 6 dollar bills, find the following probabilities:
a) Find the probability that none will be tainted.
b) Find the probability that all 6 will be tainted.
c) Find the probability that more than 4 will be tainted
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
P%28X%29=C%286%2CX%29%2A%280.9%29%5EX%2A%280.1%29%5E%286-X%29
.
.
.
P%280%29=C%286%2C0%29%2A%280.9%29%5E0%2A%280.1%29%5E%286%29
P%280%29=1%2A1%2A%281%2F10%29%5E6
P%280%29=1%2F1000000
.
.
.
P%286%29=C%286%2C6%29%2A%280.9%29%5E6%2A%280.1%29%5E0
P%286%29=1%2A%289%2F10%29%5E6%2A1
P%286%29=531441%2F1000000
.
.
.
P%28X%3E=4%29+=P%284%29%2BP%285%29%2BP%286%29


P%28X%3E=4%29+=98415%2F1000000%2B354294%2F1000000%2B531441%2F1000000
P%28X%3E=4%29++=984150%2F1000000
P%28X%3E=4%29+=19683%2F20000