![]() ![]() We are on the road to finding the probability of choosing a second red marble. So don’t forget, we have a total of 30 marbles in the bag, including 15 red marbles because you replaced the red that was initially taken out. I know you’re thinking it and you are absolutely right, our total number of marbles is still 30. So now since you’ve replaced that red marble we now have once again, that’s right 15 red marbles. So now please replace that red marble in the box. Step 2: We’re doing good, told you it was simple! Hey you can’t take that marble with you. ![]() Let’s make that into a smaller fraction 15/30 = 1/2. So the probability that your first marble is red is 15/30. The chances or probability that you just pulled out a red marble must be (you said it!) 15 out of 30. Since there are 15 red marbles and a total of 30 red marbles. What are the chances that you have just pulled out a red marble? Well that’s easy. So we dip in take a marble out (no peeking please! lol). We both know that there are 15 red marbles in the box, and that there is a total of 30 marbles in that box. But first we have to find the probability of selecting the first red marble. Now, we also know that we are going to select two marbles. Step 1: As we discovered earlier when we took those three things into consideration. And as you follow these simple steps, which I am absolutely sure you can, you will soon discover that this problem is a walk in the park and you can solve this and others just like it. Alright! Having said that, let’s begin solving this really simple problem. If you keep these three ideas together, it will help you to avoid confusing the different color marbles and second, that you don’t keep the marbles, they are being replaced in the box. The marbles that are chosen are being replaced. There is a total of 30 marbles in the box.ģ. To solve part (a) of this problem first considered the following:ġ. Find the probability of first selecting a blue then a green marble. Find the probability that both marbles are red.ī) Two marbles are selected without replacement. 6.) A box contains 30 marbles: 15 red, 10 blue, and 5 green.Ī) two marbles are selected with replacement. ![]()
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