Vocabulary
What is the definition of a Dependent Event?
Two events are dependent if the outcome or occurrence of the first affects the outcome or occurrence of the second so that the probability is changed.
What is the probability of picking out a red ball if you take out a blue ball and there are 8 red balls and 6 blue balls?
If you pick out one ball the probability to get a red ball is 8 out of 14 and to get a blue ball is 6 out of 14
What is 6/200 as a percentage?
3%
What can probability be useful for in life?
- Jobs
- Shopping
What is the definition of event?
A collection of outcomes from an experiment
From a deck of 52 cards, what is the probability of choosing two kings?
Probability of getting first king = 1/13
Probability of getting second king = 3/51
Probability of getting both kings = 1/221
What is the first thing that you have to do in a dependent event problem?
Take a marble or a piece out so that the first event can affect the rest of the events that come after
From where were the people that created probability from?
They were French mathematicians
What is average?
A number that is one way to find the typical value of a set of numbers.
If the probability that person A will be alive in 20 years is 0.7 and the probability that person B will be alive in 20 years is 0.5, what is the probability that they will both be alive in 20 years?
P(E1 and E2) equals P(E1) x P(E2)
0.7 x 0.5 equals 0.35
What is the probability formula?
P(A) = P(E) / P(S)
P(E) are the favorable outcomes
P(S) are the possible outcomes
Who created probability?
Blaise Pascal
What is a probability?
The probability is the chance that an event will or will not occur.
Two cards are chosen from a deck of 52 cards without replacement. Find the probability that one is red and second is black.
Probability of the first card being red = 26/52
Probability of the second card being black when first is chosen red = 26/51
Probability of one card being red and other being black = 1/2 x 26/51= 26/102
What is the probability of getting 1 red when you have 10 red and 20 blue?
1/30
What is one important branch of probability?
Mathematical statistics is one of the most important branches of probability
What is ratio?
A ratio is a comparison of two numbers. It can be written a few different ways.
2 out of 5 bulbs bought in a house are defective. if two bulbs are tested, then find the probability that both are defective.
Probability of the first bulb being defective = 2/5
Probability of second bulb being defective when first has already been defective = 1/4
Probability of both the bulb being defective = 2/5 x 1/4 is 1/10
Two cards are chosen from a deck of 52 cards without replacement. Find the probability that one is red and second is black.
Probability of the first card being red = 26/52
Probability of the second card being black when first is chosen red = 26/51
Probability of one card being red and other being black = 26/102
What has been the most difficult thing while creating probability?
Finding a precise definition for it