Homework Answers
P(locked homes) = 1- 0.40 = 0.60
total master keys = 8
three keys are taken and only one will open the locked home
so, probability(correct key) = 1C1*7C2/8C3 = 21/56 = 0.375
the probability that real estate agent get into a specific home = P(unlocked homes) + P(locked)*P(correct key) = 0.60+0.40*0.375 = 0.625(answer)
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