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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
How many 5 are in a deck if cards?
4 cards has 5 in it. 2 "5" on each card. means totally 8 of "5" on cards
Risk
How many permutations are in the word peak?
The first letter of the perm can be any of the 4, the second any of the remaining 3, the third either of the remaining 2. There are thus 4 x 3 x 2 ie 24 permutations.
What number can be used to describe a certain event?
The number one can be used to describe a certain event.
What is the probability of 2 coins landing on heads?
well since the coins have two sides,there is a 50% chance of it landing on heads
How many permutations are in the word geometry?
geometry has 8 letters, 2 of which are the same (e)
So, the answer is 8!/2! = 20,160
Is the distribution of sample means always a normal distribution If not why?
It need not be if:
the number of samples is small;
the elements within each sample, and the samples themselves are not selected independently.
What is the probability of a couple having a male child after already having 2 female children?
It is always 50/50.
What is the difference between simple random sampling and systematic random sampling?
simple random sample is to select the sample in random method but systematic random sample is to select the sample in particular sequence (ie 1st 11th 21st 31st etc.)
• Simple random sample requires that each individual is separately selected but systematic random sample does not selected separately.
• In simple random sampling, for each k, each sample of size k has equal probability of being selected as a sample but it is not so in systematic random sampling.
What is the relationship of the standard error of the mean to the standard error of the difference?
It would help to know the standard error of the difference between what elements.
How do you write an answer to a probability question?
Probability questions are not all the same so there is not a single kind of answer: it depends on the nature of the question!
What percent of the Z value are positive?
The standard Normal distribution is symmetric about 0 and so 50% of the Z values are positive.
the sampe mean cannot be comoputed
How many permutations are possible of the letters in the word Fresno?
There are 6! = 720 permutations.
How many different ways cant the letters deeds be arranged?
They can't be arranged in a million different ways!
