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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
If you roll a nine-sided die what is the probability you will roll a value greater than zero?
If zero is the number on one of the 9 sides, then the probability is 8/9 = 88.9% (rounded)
If zero is not the number on any one of the 9 sides, then the probability is 100%.
One in four.
The possibilities are;
Red Red
Blue Red
Red Blue
Blue Blue
That means the number of ways an event can occur is one, while the number of possible outcomes is four. The definition of probability is the number of ways the event can occur over the number of possible outcomes, hence 1/4
What is the probability of tossing a coin 25 times and it landing on heads twice?
75 over 2^23 (2 times itself 23 times, 2x2x2x2x2 etc...)
Normal curve is the meaning of standard normal distribution?
No, the normal curve is not the meaning of the Normal distribution: it is one way of representing it.
In a multiple choice test what is the probability of getting 4 correct answers?
That's really going to be heavily dependent on whether or not you know something about
the subject material, and also on the total number of questions on the test.
It has even been known to happen from time to time that there are people who will score
100% on one of those, i.e. all correct answers.
Since that happens at a rate that far exceeds random probability, many educators and
administrators have begun to suspect that some of these test-takers may actually be
going so far as to study the material in advance! But the allegation hasn't been proven.
The probability it's a king is 1/13.
The probability it's a heart is 1/4.
The probability that it is a king OR a heart is 4/13, or about 31%
There are 4 kings, and 13 hearts, but the king of hearts is both, so you can't count that twice, so you have to subtract one.
There is the king of hearts; 3 kings that are not hearts, and 12 hearts that are not the king. 1 + 3 + 12 = 16.
Divide that by the total number of cards in the deck (52), = 16/52, which reduces to 4/13. In percentage, the probability is about 31%.
What is the probability of tossing seven coins and getting 6 heads?
The probability of getting only one tails is (1/2)7. With seven permutations of which flip is the tails, this gives a probability of:
P(six heads in seven flips) = 7*(1/2)7 = 7/128
Well, if you really mean divisible by 4 then the answer is 100% that is probability 1.00.
On the other hand, if you mean evenly divisible by 4, then in the numbers 1-12 there are 3 numbers evenly divisible by 4 (4, 8, 12) since there are 12 numbers then the probaqbility of a number divisible by 4 is 3/12 = 0.25
Its simple what are disjoint events?
Two events are disjoint if they cannot occur together. In set terms, their intersection is a null set.
The probability of drawing a king followed by a queen is (4 in 52) times (4 in 51), or 16 in 2652, or 4 in 663, or 0.006033.
When tossing 3 coins simultaneously find the probability that at least 1 head is showing?
No matter how many coins are thrown, the possibility of having AT LEAST ONE 'head' is 50%. This changes if you specify the number of 'heads' that must be shown.
You roll a die What is the probability that you roll either a 5 or a 6?
In a typical die, there are six sides, so you know that there are six different possible outcomes when you roll it. In this problem, it asks for the probability of either 5 or 6 showing up. To find this simply add 1/6 to 1/6 or multiply 1/6 by 2. Either method will give you the answer of 2/6 which can be simplified to 1/3.
In a standard deck of cards of 52 cards what is the probability of drawing a heart or diamond?
1/2 or .50. Of the 52 cards, 26 are either a heart or a diamond (there are 13 hearts, 13 diamonds, 13 clubs and 13 spades).
Whats the probability that one would win the lottery if you choose 6 numbers from 56 numbers?
The probability of winning a straight lottery of 6 numbers picked from 56 is 1 in 32,468,436.
The number of combinations of n things taken m at a time is (n!-m!)/m! so this is 56 * 55 * 54 * 53 * 52 * 51 / 6 / 5 / 4 / 3 / 2 / 1 = 32,468,436.
When you get a hard on is your foreskin ment to stay over the head of your penis?
That will depend on how much foreskin you have. My foreskin used to retract upon erection until I did some foreskin stretching. Now, at this point, the foreskin remains over the glans, with just the meatus showing. I plan on stretching more to achieve total coverage in all states of erection. See the sites available on the web regarding foreskin restoration. Although I am intact, I still chose to lengthen the foreskin to achieve the coverage when erect.
What is the probability of rolling a dice?
If you pick it up, there is a 99% chance that you will roll the dice upon dropping it, and a 1% chance of it landing on one face and sitting there, not rolling.
What is the probability of getting 3 hearts from an ordinary deck of cards?
The answer depends on how many cards are drawn, whether they are drawn at random and whether they are replaced before drawing the next card.
If three cards are drawn, at random and without replacement, the probability that they are hearts is (13/52)*(12/51)*(11*50) = 1716/132600 = 0.0129
No, 12 and 18 are not coprime. Their common factors are 2, 3, and 6.
What is the probability of seeing 50 heads if a coin is tossed 100 times?
There are two sides on a coin.
The odds are 50:100, or 1:2.
Half the time the coin SHOULD land on heads.
If that's the case, then the odds of the visiting team of winning is 1 to 3.
What is the probability of having 6 boys and three girls?
The question cannot be answered properly because the children's genders are not independent events. They depend on the parents' ages and their genes. Furthermore, it is often wrongly assumed that the probability of a boy is 50%. That is simply not true: the latest information shows that the probability of a boy is 52%.
However, if you choose to ignore reality then the solution, based on the Binomial(9, 1/2) distribution, is that the probability is 0.1641, approximately.
Can the probability of an outcome be more than 1?
No, the probability of an outcome can't be more than 1.
What is the probability of getting curly hair?
The probability of getting curly hair depends on whether your parents do or not. Hair genes are decided by the mother. So, if the mother has curly hair, more than likely the offspring will as well. If the father has curly hair and the mother does not, the probability is considerably lowered.
