SOLUTION: (1) Exactly the half of the 10 batteries, that you save on a closet, are not charged but you don't know which of them are. You are in a hurry to leave on holidays and you take 4 ba

Question 869899: (1) Exactly the half of the 10 batteries, that you save on a closet, are not charged but you don't know which of them are. You are in a hurry to leave on holidays and you take 4 batteries from the closet but you don't have the time to check if they are not charged or charged. What is the probability none of the 4 batteries is charged?
(2) Before you leave on holidays, you remember that in the drawer of your desk, there are 10 other batteries, but again the half of them are not charged and you don't know which of them are, neither you have the time to check them. Due to the space on your bag, you can ONLY take 4 batteries for your trip.
Compare the below options towards the probability that all the batteries that you took are not charged.
(i) You take 4 batteries from the drawer and none of them from the closet.
(ii) You take 2 batteries from the closet and 2 from the drawer.
(iii) You put all 20 batteries in a bag, you mix them up and you pick 4, and you take them.
(3) Compare the options of the previous question towards the average number of the charged batteries that you took.
Answer by ScientificArt(6) (Show Source): You can put this solution on YOUR website!

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