What am I doing wrong? (Probability)
The question is:
A large bag of marbles contains equal amounts of each of 5 colors (red, orange, yellow, green, and blue). Joaquin selects 1 marble, looks at it, puts it back, and then selects another. Find the probability of Joaquin selecting a yellow marble both times.
I figured I had to find the probability of picking a Y out of 10 marbles. (I just chose ten as it would be easiest?) So that means there would be two Y marbles in said bag.
So, total = 10
And each time, you should have 2/10 as the probability of piking out a Y marble.
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2/10 + 2/10 = 4/10 = 2/5 = 0.4
But that is not an option?
The choices are:
My question is what am I doing wrong?
you can just take it out of 5
1 yellow out of 5 total for 1st time
1 yellow out of 5 total for second time
now the mistake you did was too add them...