The probability of drawing a green marble depends on how many green marbles there are compared to the total; for example, 4 green out of 16 total marbles gives you a 25% chance.
What is the probability that the marble will be any one Colour?
Every single color has a 100% chance of appearing—one of the possible colors must come up.
That’s the law of total probability in action. All possible outcomes add up to certainty. Think of a coin flip: it’s always either heads or tails, so the chance of “either one” is 100%.
What is the probability of selecting a green marble?
If a jar holds green, white, and yellow marbles with one green in every four marbles, the chance is 1 in 4, or 25%.
This assumes you’re grabbing one at random—every marble has the same shot. Got 10 marbles and 2 green? Then the odds jump to 2 in 10, or 20%. Always tally the total marbles and the green ones first before you do the math.
What is the probability of blue or green?
If 2 of 10 marbles are blue and 3 of 10 are green, the combined chance is 5 in 10, or 50%.
You just add their individual odds because “blue or green” are events that can’t happen at the same time. That’s the addition rule in simple terms.
What is the probability that the marble will be red *?
If 2 of 5 marbles are red, the probability is 2 in 5, or 40%.
The star usually means “ignore the rest of the setup” and treat it as a straightforward fraction. Double-check the total marbles and the red count before you divide.
What is the probability of choosing a yellow marble?
If 7 of 16 marbles are yellow, the chance is 7 in 16, or about 43.75%.
Start by counting every marble. Then count how many are yellow. Divide the yellow count by the total and, if you can, simplify the fraction. That’s all there is to it.
What is the probability of picking blue marble?
If 6 of 10 marbles are blue, the chance is 6 in 10, which simplifies to 3 in 5, or 60%.
Classic marble-jar stuff. The trick is that every marble has an equal shot. Pull one out without putting it back and the odds shift for the next draw.
What is the probability that the marble is not green?
If the chance it’s red or green is 0.8, then the chance it’s neither is 0.2, or 20%.
Just subtract the event’s probability from 1. That’s the complement rule: P(not A) = 1 – P(A). It’s quicker than adding up all the other colors.
What is the probability of event equal to zero is called?
A probability of zero is called an impossible event.
Officially, it’s a zero-probability event. These things could, in theory, happen, but the math says they won’t. Rolling a 7 on a standard die? Impossible—so its probability is 0.
What is the probability of getting a number 5?
On a standard six-sided die, the chance of rolling a 5 is 1 in 6, or about 16.7%.
| Outcome | Single Roll Probability |
|---|
| Rolling a 5 | 1/6 (≈16.7%) |
| Rolling 5 or more | 2/6 (≈33.3%) |
A die has six faces, all equally likely. Only one face shows a 5, so the odds are one out of six.
What is the probability of getting green?
If x green marbles and y black marbles remain, the chance to draw green is x/(x+y).
This assumes you’re drawing without replacement and only green and black marbles are left. Add the remaining green and black marbles to get the denominator.
What is the probability of getting a blue on this spinner?
If the spinner is split into four equal sections and one is blue, the chance is 1 in 4, or 25%.
Treat the spinner like a pie cut into equal slices. Count the blue slice and divide by the total slices. Works the same way for any spinner with equal-sized sections.
What is the probability to getting a number smaller than 11 A 1 B 0 C D?
The probability of drawing a number ≤11 from 0 to 50 inclusive is 12 out of 51, or about 23.5%.
Count how many numbers fall at or below 11 (0 through 11). Divide that by the total numbers (51). It’s a uniform, discrete distribution.
What is the probability of choosing red?
If 10 of 16 marbles are red, the first-draw chance is 10/16, which simplifies to 5/8, or 62.5%.
Count the total marbles first, then count the red ones. Divide red by total—that’s the basic probability formula: favorable outcomes over total possible outcomes.
