There Are Seven Black Marbles And Nine White Marbles

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There are seven black marbles and nine white marbles. 9 blue marbles 8 green marbles 4 red marbles 8 white marbles and 6 yellow marbles. What is the approximate probability of drawing two black marbles and then. So let s draw this bag here. On the first you have 10 16 chances to draw a red.

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. Take out a marble. What is the probability of randomly selecting a non blue marble from of the bag. There are 35 marbles in a bag.

Call it the second marble. 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. There are seven black marbles and nine white marbles in a 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.

There could be anywhere between zero and 100 black marbles and the appropriate number of white marbles to make up the balance. There are 18 marbles in total. Let s do a couple of exercises from our probability one module. You draw ten marbles out as before and this time you get seven black and three white.

2 see answers answer expert verified 4 2 5 2. Supposing this red is not replaced the chance of drawing a second red will be 9 15. Trivially then the answer is frac 1 3 since there is one white. The probability of drawing to marbles then a white one without replacement will be as follows.

Therefore the probability of a is 10 16 9 15 0 375. What is the theoretical probability of pulling a red marble from the bag. Write the probability as a fraction in simplest form a decimal and a percent. A bag contains five yellow marbles nine red marbles three blue marbles six white marbles and seven black marbles.

Note that there are 16 total marbles. 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. P r r 9 20 9 20 81 400 2025.