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How many marbles do you need to add to make the probability of choosing a blue marble equal to a half?
Wiki User
∙ 12y ago
That's going to depend on several facts which, sadly, you've chosen
not to share with us, such as:
-- How many marbles are in the pot before you add any ?
-- How many of those originals are blue ?
-- How many of the ones you add will be blue ?
-- How many will you chose ?
-- Will you keep each one you choose or replace it ?
All of these make a difference. Since we don't have any of this information,
any intention we may have to answer the question is doomed.
Wiki User
∙ 12y ago
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A bag contains 3 green marbles 5 blue marbles and 2 yellow marbles one marble is drawn from the bag what is the probabitity that a blue marble is chosen?
the probability that a blue one is chosen is 5/10 which is equal to 1/2
What is the probability of choosing an odd number?
If you have an equal amount of odd and even numbers in a determined sample space, the probability of choosing and odd number is 1/2 (.5).
What is a biased coin in probability?
Probability of getting a head or tail is not equal
What is the event if the probability will equal 1?
It is the probability of an event that will definitely happen.
What does total probability equal?
For any particular trial, the total probability is 1.
A bag contains 3 green marbles 5 blue marbles and 2 yellow marbles one marble is drawn from the bag what is the probabitity that a blue marble is chosen?
the probability that a blue one is chosen is 5/10 which is equal to 1/2
What is the probability that a marble drawn at random is not red if a jar contains 3 red 4 blue and 2 white marbles?
i think 6 out of 9 right? then you simplify to equal 1 out of 3.:)
What is the probability of choosing an odd number?
If you have an equal amount of odd and even numbers in a determined sample space, the probability of choosing and odd number is 1/2 (.5).
How much is 3 moles of marbles?
Marble is mainly CaCO3 so its one mole is equal to 100 g.
A bag has 6 marbles in iteach marble is either rad blu or green what is the least number of marbles that you must pull ou of the bag to be sure you have two marble the same color?
Since each of the three colours has an equal chance of being drawn, theoretically if you draw four marbles from the bag, you should have at leas two of the same colour.However, there is a 1/3 (33.33%) chance that the first two marbles you pull out will be the same color. There is just a guarantee that you will have two of at least one color after pulling out four.
A bag contains 2 purple marbles and 6 green marbles - Two marbles are drawn at random - so What is the probability that the first marble drawn is green and the second one is purple?
There are 8 marbles in the bag, and 6 are green, so the chance that the first one you pick is green is 6/8 or .75. Let's call the event where you pick the green marble first, G, for green of course. Now since you picked a marble there are only 7 left. If you picked a green one then the chances of picking a purple one are now 2/7 since there are two purple marbles and seven total marbles. Let's call the event of picking the purple marble F, (I was going to use P but we need that letter for probability. Purple is a fine color so I picked F.) Now we use the conditional probability rule that tells us what is the chance of picking purple given that we already picked green. The symbol P(F|G) means probability of event F given that event G has already happened. P(F|G)= (the probability of picking green and purple)/ (probability of picking green.) We know these from above. G=6/8 and If we pick a green, probability of picking a purple is 2/7 so we multiply these to get probability of picking both and we have 6/8x2/7 or 12/56. So 12/56=(Probability of Picking green and purple)/( probability of picking green). We have 12/56=[P(G and F)]/(6/8) we want P(G and F) so we multiply 12/56x 6/8 and we have 72/448 So the answer is : 72/448 or about .16 (NOTE: this would be a totally different problem if we took out the first marble then put it back. It is important to be sure what is being asked. If you replaced the marble, the problem is much easier. It is simply 6/8 x 2/8 =12/64 or 3/16) Some people have trouble remembering or understanding the conditional probability rule. I will take just a second to explain it in the hopes it will make it easier to use and remember. The multiplication rule says if we have two mutually exclusive events, A and B, the probability of A and B is P(A)xP(B), so if we want event A to occur THEN event B, we have P(A)xP(B|A) which means probability of A multiplied by probability of B given A has already happened. This equal probability of A and B so we have: P(A)xP(B|A)=P(A and B) . Now divide by P(A) and we have: P(B|A)=P(A and B)/P(A). This is the way the rule is usually stated. Note: P(A|B)=P(A and B)/P(B).
How do you describe a planets gravity in words?
A planet's gravity is cause by it's mass (how big it is and it's density). The bigger it is the stronger it's gravitationally pull is. Imagine this: that all the planets are marbles (with the size of the marble equal to how big the actual planet is) and imagine that all the marbles are on a stretchy cloth suspended in air on earth, the bigger marbles should make the cloth go down in that area and causes the other marbles to come to it.
What does no more than mean?
This is a simple one, it basically means that whatever quantity is stated is equal to the amount specified or less. eg. What is the probability that a boy chooses no more than 7 marbles.(this is basically saying that the boy is going to choose 7 marbles or less). Hope i helped
What does fair means in probability?
From a probability perspective fair means equal probability.
What is the differences between equal probability and equal width in measurement?
One is a measure of probability, the other is a measure of width! And neither is the same as equal age, or equal loudness!One is a measure of probability, the other is a measure of width! And neither is the same as equal age, or equal loudness!One is a measure of probability, the other is a measure of width! And neither is the same as equal age, or equal loudness!One is a measure of probability, the other is a measure of width! And neither is the same as equal age, or equal loudness!
2 out of 3 of John's marbles is equal to 3 out of 5 of Max's marblesThey have 266 marbles altogether How many marbles does John have?
2 out of 3 times 3 out of 5
What does fair mean from a probability perspective?
From a probability perspective fair means equal probability.
