Question 181873
The probability that a particular type of smoke alarm will function properly and sound an alarm in the presence of smoke is 0.8. You have 2 such alarms in your home and they operate independently. 
What is the probability that both sound an alarm in the presence of smoke is 
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P(success and success) = 0.8*0.8 = 0.64
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Cheers,
Stan H.