SOLUTION: In a particular suburb, 30% of the households have installed electronic security systems. a. If a household is chosen at random from this suburb, what is the probability that thi

Question 213506This question is from textbook
: In a particular suburb, 30% of the households have installed electronic security systems.
a. If a household is chosen at random from this suburb, what is the probability that this household has not installed an electronic security system?
b. If two households are chosen at random from this suburb, what is the probability that neither has installed an electronic security system? This question is from textbook

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
In a particular suburb, 30% of the households have installed electronic security systems.
a. If a household is chosen at random from this suburb, what is the probability that this household has not installed an electronic security system?
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P(not installed) = 1 - P(installed)
= 1 - 0.3
= 0.7
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b. If two households are chosen at random from this suburb, what is the probability that neither has installed an electronic security system?
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P(not and not) = 0.7^2 = 0.49
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Cheers,
Stan H.

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