Hi, I'm sitting with this question that has been bugging me:
Reading the question, I assume the answer is 50% - since the question reads; "You pick a container, then pick a marble", the marbles have nothing to do with what container I picked.. So it is a trick question yes?
On the other hand, had the question read, "you pick a marble, it is red, what is the probaility that you picked it from container A?" then;
Out of 80 marbles, theres is (50/80)*100 = 62,5 % chance of picking a red.
Out of the 50 red marbles, theres a (30/50)*100 = 60 % of that red being from container A.
What do you guess think? How do you read the question?
Thanks!
"You have two containers, A and B, each holds two types of marbles, red and blue.
Container A holds 30 red and 10 blue.
Container B holds 20 red and 20 blue.
You pick a random container and pick up one red marble.
What are the probability that you picked container A? "
Container A holds 30 red and 10 blue.
Container B holds 20 red and 20 blue.
You pick a random container and pick up one red marble.
What are the probability that you picked container A? "
Reading the question, I assume the answer is 50% - since the question reads; "You pick a container, then pick a marble", the marbles have nothing to do with what container I picked.. So it is a trick question yes?
On the other hand, had the question read, "you pick a marble, it is red, what is the probaility that you picked it from container A?" then;
Out of 80 marbles, theres is (50/80)*100 = 62,5 % chance of picking a red.
Out of the 50 red marbles, theres a (30/50)*100 = 60 % of that red being from container A.
What do you guess think? How do you read the question?
Thanks!
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