Probability is the chance or likelihood that an event will happen.
Marble simple probability examples trees.
Use these examples of probability to guide you through calculating the probability of simple events.
One example uses with replacement and one example uses without replacement.
This is called probability without replacement or dependent probability.
It is the ratio of the number of ways an event can occur to the number of possible outcomes.
A coin is biased so that it has a 60 chance of landing on heads.
This video goes through 2 examples of probability.
Again we ll have to think about the possible outcomes first.
We ll use the following model to help calculate the probability of simple events.
The first ball can be red yellow or blue.
There are 3 balls in a bag.
One ball is picked out and not replaced and then another ball is picked out.
For example a marble may be taken from a bag with 20 marbles and then a second marble is taken without replacing the first marble.
We calculated p drawing a non red 455.
Another way of representing 2 or more events is on a probability tree.
This means the first two are not red.
The sample space for the second event is then 19 marbles instead of 20 marbles.
Is a wonderful way to picture what is going on so let s build one for our marbles example.
There is a 2 5 chance of pulling out a blue marble and a 3 5 chance for red.
If it is thrown three times find the probability of getting a three heads b 2 heads and a tail c at least one head.
Red yellow and blue.
The first red a jar contains 30 red marbles 12 yellow marbles 8 green marbles and 5 blue marbles you draw and replace marbles 3 times.
The probability is 1 3 for each of these.
We can use a tree diagram to help us find the probability.
We can go one step further and see what happens when we pick a second marble.
So they say the probability i ll just say p for probability.
This math education video demonstrates how to calculate the probability of removing colored marbles from a bag.
Probability tree diagrams for independent events how to solve probability problems using probability tree diagrams.
This is the currently selected item.
Dependent events are what we look at here.
And so this is sometimes the event in question right over here is picking the yellow marble.
Find the probability of pulling a yellow marble from a bag with 3 yellow 2 red 2 green and 1 blue i m assuming marbles.
Problems demonstrate non conditional and cond.
