What is the probability of picking a blue marble in bag?
There are 6+3+7 = 16 marbles in the bag, and 16 choose 1 = 16 ways to choose a marble out of the bag. Out of those 16 ways, three of them will result in a blue marble. Thus, the probability is 3/16.
What is the probability of drawing picking a black marble?
There are 20 total marbles, of which 5 are black and 4 are red. Assuming that marbles are chosen at random (no peeking), the probability of drawing a black marble at random is 5/20 or 1/4.
What is the probability of getting a red marble?
If the marble is not “replaced”, the probability of the second drawing changes, since there are less marbles in the jar. The probability of drawing a red marble = 2/5.
What is the probability that all marbles are red?
The probability the first marble is red is 9/23, leaving 22 total marbles and 8 red ones. The probability the second marble is red is 8/22, leaving 21 total marbles and 7 red ones. The probability the third marble is red is 7/21, leaving 20 total marbles and 6 red ones. The probability the fourth marble is red is 6/20.
What is the probability of selecting 2 red marbles from the bag?
The probability of selecting 2 red marbles from the bag, consecutively and with replacement, is 31\%. There is a bag filled with 5 blue and 6 red marbles. A marble is taken at random from the bag, the colour is noted and then it is replaced. Another marble is taken at random.
How many marbles are in the bag of blue and red?
There is a bag filled with 4 blue and 5 red marbles. A marble is taken at random from the bag, the colour is noted and then it is replaced. Another marble is taken at random. What is the probability of getting 2 reds?
What happens when a marble is taken at random?
A marble is taken at random from the bag, the colour is noted and then it is not replaced. Another marble is taken at random. What is the probability of getting 2 of the same colour?
What are the odds of getting a blue marble?
For each draw, the chances of getting a blue marble are 3 of 7; the chances of getting a red are 4 of 7. The chances of drawing a blue on both draws is (3/7)^2 or 9/49, and the chances of getting red on both draws is (4/7)^2 or 16/49.