Probability

# Why marble bag has four marbles one is green and one is red one is blue and one is yellow which is a simple event?

**We need you to answer this question!**

###### If you know the answer to this question, please register to join our limited beta program and start the conversation right now!

## Related Questions

###### Asked in Math and Arithmetic, Statistics, Probability

### What is the probability of drawing a white marble then a red marble if there are 3 red marbles and 2 white marbles?

5 marbles. 3 red marbles, 2 white marbles.
The probability of drawing a white marble is P(W) = 2/5 =
0.40
If the white marble is not returned to the rest of the marbles
(no substitution), the
probability that the second marble drawn is a red one is P(R) =
3/4 = 0.75.
The probability that the event of drawing first a white marble
and without substitution
the second draw turns a red marble is P(1stW,2ndR) =
(2/5)∙(3/4) = 6/20 = 3/10 = 0.30 = 30.0%.
If the process of drawing the marbles is with substitution, the
probability of the
second draw turning a red marble is P(R) = 3/5 = 0.60 =
60.0%
The probability that the event of first drawing a white marble
and after returning the
marble back to the original group of marbles (with
substitution) the second draw turns a red marble is
P(1stW,2ndR) = (2/5)∙(3/5) = 6/25 = 0.24 = 24.0%.

###### Asked in Math and Arithmetic, Probability

### Explain how to find the probability of choosing a green marble from a bag of marbles containing 5 green 3 blue 6 red and 12 white?

If you pick only one marble from the bag, at random, it can be
any one of 26 marbles. Out of these, 5 of the marbles are green.
Thus, there are 26 possible outcomes out of which 5 are favourable
- to the event that the marble is green. Therefore the probability
of a green marble is 5/26.
The calculations become more complicated if you consider
choosing a green marble in several attempt: it depends on whether
or not the marbles are replaced before the next one is picked.

###### Asked in Math and Arithmetic, Algebra

### What does equally likely events in math term mean?

When you are asked what is the probability of drawing "thing a"
when you have only the same amount of "thing b," is called an
equally likely event. For example: In a hat you have 8 black
marbles and 8 black marbles. Since there the same amount of both,
the chance of picking a black marble is 50% and picking a blue
marble is 50%. This is an equally likely event.

###### Asked in Math and Arithmetic

### How do you find the probability of 4 blue marbles 5 red marbles 1 green marble and 2 black marbles?

It depends what probability exactly you want to find.
probability = number of successful ways / total number of
ways
If the problem is:
You have a bag containing 4 blue, 5 red, 1 green, 2 black marble
what is the probability of picking a blue marble at random?
Then
successful ways = 4 as there are 4 blue marbles
total ways = 12 as there are 4 [blue] marbles + 5 [red] marbles
+ 1 [green] marble + 2 [black] marbles = 12 marbles in total.
pr(picking a blue) = 4/12 = 1/3
Perhaps the problem is:
You pick 2 marbles at random without replacing them, what is the
probability that they are the two black marbles?
Each picking of a marble is an event and the two events are
independent (in the sense that whatever you pick first does not
affect the probability of the second pick) so you multiply the
probability of each together:
pr(1st black) = 2/12 = 1/6
pr(2nd black) = 1/11 (there is 1 less black marble in the
bag)
pr(2 blacks) = 1/6 × 1/11 = 1/66
Perhaps it is:
You pick 2 marbles at random replacing the marble after the
first pick, what is the probability of picking the same colour each
time?
This time there are 4 possible colours and the probabilities of
2 marbles the same is calculated for each (similar to above) and
then they are added together to find the total probability of 2
marbles of the same colour:
pr(blue) = 4/12 → pr(2 blue) = 4/12 × 4/12 = 16/144
pr(red) = 5/12 → pr(2 red) = 5/12 × 5/12 = 25/144
pr(green) = 1/12 → pr(2 green) = 1/12 × 1/12 = 1/144
pr(black) = 2/12 → pr(2 black) = 2/12 × 2/12 = 4/144
→ pr(2 the same colour) = pr(2 blue) + pr(2 red) + pr(2 green) +
pr(2 black)
= 16/144 + 25/144 + 1/144 + 4/144 = 46/144 = 23/72
And so on.

###### Asked in Nintendo DS, Harvest Moon (video game)

### What is griffins green heart event?

Griffin does not have a Green Heart Event. He only has four;
Black Heart Event, Purple Heart Event, Blue Heart Event, and a
Yellow Heart Event.
So you will have to raise his Heart Color once more before you
can get the next Heart Event. Once you do get a Yellow Heart with
him here is how to get the Event:
Yellow Heart Event:
» Walk from Your Farm to the Main Pathway
» 12:00 pm to 3:00 pm, not Wednesday, sunny day
» Griffin has a yellow heart color or higher
» You have seen the black, purple, and blue heart events
There is also no Orange or Red Heart Event. The Yellow is the
last one.

###### Asked in Math and Arithmetic

### What is the math meaning of event?

An event is a collection of results or outcomes from some
procedure or experiment.
For example, if I toss a coin twice, {h, t} is an event.
If an event cannot be broken down into smaller or simpler
components, it is called a simple event. For example, the event of
2 heads and one tail is not a simple event.
It can be hht, hth etc. Each of those, however, is a simple
event.
The sample space is made up of all possible simple events.

###### Asked in Probability

### What is probability?

###### Asked in Math and Arithmetic, Probability

### 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).

###### Asked in Harvest Moon (video game)

### I did the blue heart event for Muffy on Harvest Moon DS and her heart didn't turn yellow why?

First of all the order of the heart events are
black>purple>blue>green>yellow>orange>red. You
have to keep giving her gifts afterwards, as the heart event does
not change the color of her heart. Keep giving her gifts until her
heart turns green and then eventually yellow. Yellow is the next
and last heart event after blue. But there is no heart event for
green and orange.