There Are Seven Black Marbles And Nine White Marbles

There are seven black marbles and nine white marbles in a bag.
There are seven black marbles and nine white marbles. Let s do a couple of exercises from our probability one module. What is the theoretical probability of pulling a red marble from the bag. Total number of marbles 16 total number of black marbles 7 total number of white marbles 9 probability of drawing a black marble on first 7 16 probability of drawing a black marble on second draw 6 15 probability of drawing a white marble on the 3rd draw 9 14. Trivially then the answer is frac 1 3 since there is one white.
Call it the second marble. Supposing this red is not replaced the chance of drawing a second red will be 9 15. All of the original white marbles are still in the bag so there is a 4 out of 17 or 4 17 chance that the next marble taken out of the bag will be white. 2 see answers answer expert verified 4 2 5 2.
So we have a bag with 9 red marbles 2 blue marbles and 3 green marbles in it. The probability of drawing to marbles then a white one without replacement will be as follows. P r r 9 20 9 20 81 400 2025. One of them is removed so now there are 17 marbles.
9 blue marbles 8 green marbles 4 red marbles 8 white marbles and 6 yellow marbles. Take out a marble. There are a number of ways of approaching this problem but the easiest solution is to realize that it doesn t matter what order you took the marbles out in. There are 35 marbles in a bag.
On the first you have 10 16 chances to draw a red. Note that there are 16 total marbles. So let s draw this bag here. There are 18 marbles in total.
You draw ten marbles out as before and this time you get seven black and three white. This is our denominator. Therefore the probability of a is 10 16 9 15 0 375. Write the probability as a fraction in simplest form a decimal and a percent.
There could be anywhere between zero and 100 black marbles and the appropriate number of white marbles to make up the balance. This second urn also contains 100 marbles that are either black or white but you do not know their breakdown. So that s my bag and we re going to assume that it s a transparent bag so it looks like a. A is simply a set of sequential events.