SOLUTION: A cape Town courier service promises that 20% of Johannesburg bound parcel deliveries will reach their destinations within 12 hours. What is the probability that of the seven parce

Question 1113229: A cape Town courier service promises that 20% of Johannesburg bound parcel deliveries will reach their destinations within 12 hours. What is the probability that of the seven parcels sent at random times by a particular client in cape Town, only one is delivered within 12 hours?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
This is 7 (the number of ways)*0.2^1*0.8^6=0.3670
Expected value is 7*0.2=1.4, so having 1 is fairly high probability as this is.
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