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Probability
The probability of a certain event is a number expressing the likelihood that a specific event will occur, expressed as the ratio of the number of actual occurrences to the number of possible occurrences. In mathematics, it is a measure of how often an event will happen and is the basis of statistics.
14,643 Questions
What is difference of population sample?
The population consists of every possible unit where a sample is a subset of the population. Note that population and sample need not refer to persons. For example, if studying biodiversity, the population could consist of plots of land.
It is 0.9955 of the total area.
What does it mean to have a probability of 0.05?
It means that there is a probability or chance of 0.05 or 1 in 20 of observing the relevant event.
How many 2 of spades out of a deck of 52 cards?
There is just one such card in a normal deck of cards.
What is the probability of something ever happening?
Something just happened. As something would have to happen to make nothing happen, the probability of something else happening is approximately 100%.
If you have a more specific definition of something, probability can be calculated by [# of events] divided by [# of possible outcomes].
For example:
> The chances of rolling a 1 or a 2 on a 6-sided die
- calculated by 2[either rolling a 1 or rolling a 2] divided by 6[either rolling a 1 and rolling a 2 and rolling a 3 and rolling a 4 and rolling a 5 and rolling a 6]
- 2/6 = 1/3 = One in Three ~ 33.333%
- calculated by ∞[infinite number of somethings] divided by ∞[infinite possible occurences of something]
- ∞/∞ = 1 = 100%
Is standard deviation biased or unbiased?
Standard deviation (SD) is neither biased nor unbiased. Estimates for SD can be biased but that depends on the formula used to calculate the estimate.
1. What I Would Do Is Add 2+3+5+6 Which Is 16
2. So Now You Know There Are 16 Marbles
3.Look At How Many Red And Blue Marbles There Are
4. Red=6
5.Blue=2
6. So 6+2=8
7. Your Answer Is 8/16 Or 1/2
8. So The Answer Is 8/16 Or In Simplest Form 1/2
What is the probability of drawing a spade and a diamond in any order?
Assume that you start with a well-shuffled regular 52-card deck (no jokers) and draw 2 cards.
The first card can be either a spade or a diamond, giving you 26 possibilities out of the 52 cards, for a probability of 26/52 or 1/2.
The second card must be of the other desired suit, giving you 13 possibilities out of the 51 remaining cards, for a probability of 13/51.
The total probability is then the product of the two, 1/2 x 13/51 = 13/102, or about 12.74%.
Assuming that you are using a full deck of playing cards, excluding Jokers, there would be four 3s in a deck of fifty-two total cards, making your chances of drawing a 3 the first time 1:13. However, to draw two 3s in a row in a true random scenario, we start with the condition that you have already drawn your first 3 (the 1:13 chance). Going from here, we would then have another 1:13 chance of drawing a 3, so we simply multiply the two ratios to arrive at a probably of 1:169.
We would need to know which events you're referring to to respond to this question.
What is the probability of rolling a product of 30 when rolling two dice?
There are only 2 outcomes in which this happens. Di 1 = 5, Di 2 = 6 or Di 1 = 6, Di 2 = 5.
This is 2 possibilities out of 36. 2/36 is 0.055556.
How do you combine probability to non probability sampling?
There are many methods: stratified random sampling and cluster sampling are two examples.
Suppose you have a school with 1000 pupil: 400 in the Junior school and 600 in the Senior school. You may wish to keep the sampling proportions in the two parts of the school the same. So if you wanted a sample of 5% = 50 pupils, you would take a probability or random sample of 5% = 20 from the Juniors and 5% = 30 from the Seniors.
For the second example, imagine you want to sample 5% of all schools in the country. This could result in you spending lots of time and money travelling from place to place. Instead, you divide up the country into 100 regions - each containing the same number of schools. You then take a probability sample of 5% of these regions. In each of the regions you visit every school.
What is the probability of drawing two aces from a deck of 52 cards?
The answer depends on how many cards are drawn, and whether they are drawn with or without replacement. If 1 card is drawn, the probability is 0, if 50 cards are drawn (without replacement), the probability is 1.
If only two cards are drawn, at random and without replacement, the probability is (4/52)*(3/51) = 12/2652 = 0.0045
What is the probability that three f2 seeds chosen at random will include at least one yellow seed?
One would need more facts about the situation to be able to answer this question.
What is the probability of an event that is affected by two or more different events called?
A dependent probability.
Theoretical probability = 0.5
Experimental probability = 20% more = 0.6
In 50 tosses, that would imply 30 heads.
What is the probability of not getting a club in a deck of 52 cards?
The probability of not getting a club is the same as the probability of getting one of the other suits. There are (52-13)=39 such possibilities out of 52. Hence the probability is 39/52=3/4.
What is the probability of drawing a 7 and a club from a deck of cards?
The answer depends on how many cards are drawn.
What exact percent falls the normal curve falls below at Z score of -2.00?
Although I cannot prove it, I doubt that there is a nice closed-form expression for this quantity; it's probably not a rational number.
It's value is approximately 0.0227501319482. (Using Python code.)
