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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 we include both 1 and 50 there are 50 numbers to choose from. The numbers that are divisible by 7 in that range are 7, 14, 21, 28, 35, 42,and 49. There are 7 of them.
So the answer would be 7 out of 50, which is 14%.
What is the probability of flipping a coin and having it land on heads two times in a row?
We have no way of knowing the probability of any given person flipping
any given coin at any given time. But for any two flips of an honest coin,
the probability that both are tails is 25% . (1/4, or 3 to 1 against)
true but the amount their chances increase is very tiny
How do you use mental math to solve 80 divided by 40?
80 divided by 40 is the same as 8 divided by 4, which is two.
First you have 3 blues out of 13 cards, so the first card has probability 3/13. Then you have 2 blues out of 12 cards, so the second card has probability 2/12 or 1/6. The probability of both being blue is the product of these probabilities:
P(two blues) = P(first blue) * P(second blue) = (3/13) * (1/6) = 3/78 or 1/26
How can you choose a random sample of teachers?
The first step is to establish a sampling frame. This is a list of all teachers in the domain that you are interested in.
Next you allocate a different number to each teacher.
Then you use a random number generator to generate random numbers. You select each teacher whose number is generated. If the teacher has already been selected for inclusion in the sample, you ignore the duplicate and continue until you have a sample of the required size.
What are two ways that you can express a probability?
useing a punnett square shows two ways to express probability
What is the probability of genotypes and phenotypes?
What is the probability that any of the offspring between individuals with the genotype AABbCcddEE will have the genotype AABBCCddEE
What is the probability of an adverse event ocurring?
There terms frequent, likely, occasional, seldom, and unlikely, used in the risk assessment matrix is the level of
There is insufficient information for us to answer this question. Please edit the question to include more context or relevant information. It would be useful to know which lottery from which country the question refers to.
The faces greater than 2 are 3, 4, 5 and 6 ; that's 4/6 = 2/3
A flipped coin will be Heads 1/2 and Tails 1/2
Combining these we have a probability of 1/2 times 2/3 = 1/3
So the probability of the combined events is 1/3 or 33.3(recurring)%
What is the experimental probability of rolling one die 100 times and getting a 1 or a 2 39 times?
Experimental probability depends on each trial. It is not known until you conduct the trial. You are probably talking about theoretical probability in the question.
The solve this problem, simplify it...
The probability of rolling a 1 or a 2 in a standard six sided die is 1 in 3, or about 0.3333. Remember this, because I'm going to change the problem.
Think about throwing a coin. What is the probability of throwing 39 heads in 100 coin tosses? Its the same problem, and I'll show this at the end.
The probability of throwing a head is 1 in 2, or 0.5. The probability of throwing 39 heads in 100 coin tosses is more difficult.
The real question is, what is the number of combinations of 100 things taken 39 at a time? Sound familiar? It better. Each of those 39 events corresponds to a head, and the 100 things is the number of coin tosses. The answer is that the number of combinations of 100 things taken 39 at a time is 100! / (39! (100-39)!), or about 9.0139 x 1027.
Since probability is the number of permutations of the desired outcome divided by the number of permutations of the possible outcome, simply divide the above number by 100!, or 9.3326 x 10157, getting about 9.6585 x 10-131.
Now, back to the original problem. We were talking about a six-sided die, and wanting a sample space of 6, but coins have a a sample space of 2. Reconsider and you find that the actual sample space is 3, because we want a 1 or a 2, so multiply 9.6585 x 10-131 by 2/3 to get 6.439 x 10-131. That is the probability of rolling a 1 or a 2 exactly 39 times in 100 rolls.
From Rafaelrz:
You have two possible events in a single throw of the die: A, die comes out 1 or 2; B, die comes out 3,4,5,or 6.
Probability of events are; P(A) is 1/3, P(B) is 2/3.
If you want 39 'A' events in a trial of 100 throws, the number of ways this events
can happen ( in which number of throw they appear ) is given by the number of
combinations above calculated nCr (n is 100, r is 39) with the result of about
9.01392403 x 1027.
Then, the probability of getting 39 'A' events in a trial of 100 throws is:
100C39 x [P(A)]39 x [P(B)]61 equal to 9.01392403 x 1027 x (1/3)39 x (2/3)61
equal to 0.040329065 ( Theoretical probability )
What is the probability of getting a two on one dice?
Total number of possible rolls with 2 dice = 36.
Total number of rolls that are doubles = 6.
Probability of rolling doubles= 6/36 = 1/6 = (16 and 2/3) percent .
All the cards that are diamonds have an i in, so that's 13. Of the other suits, there are 3 fives, 3 sixes, 3 eights, 3 nines and 3 kings. So in total, there are 28 cards with an i in. The probability of getting a card with an i is therefore 28/52. This can be simplified to 7/13
subjective
The probability of drawing a red card is 1/2 (26/52).
The probability of drawing a face card is 3/13 (12/52).
The probability of drawing a red face card is 3/26 (6/52).
The probability of drawing a red card or a face card is 8/13 (32/52).
2 out of 52
or 1 out of 26.
What is the most probable ion formed from Li?
The only probable ion to form from Lithium is the Li+ ion.
What is the probability of getting 3 girls in a family of 10 children?
The probability of exactly 3 girls in a family of 10 children, assuming equal chance of a boy or girl, is 0.1172. This is a binomial distribution.
Which Queen is depicted on playing cards?
The queen on a standard modern deck of Anglo-American playing cards depicts no one in particular, and is most likely a distorted version of older versions of European cards.
Older sets of cards typically varied based on the origin of the card. Face cards typically depicted historical figures of religious or political importance.
Source: Wikipedia
How do you identify a normal curve?
You cannot. It has a characteristic bell-shaped curve but so does a Student's t with enough degrees of freedom. There are other distributions which, with suitable choice of parameters can be made to look very similar to the Normal curve.
What was the major event that occurred in 2000?
The disputed election for President of US, between Albert Gore and George W Bush.
What is the chance of getting a password right with random letters?
Around 65-70%. I am a expert on the subject and have preformed many experiments where I have someone type random letters and see the outcome. Most of the time it is right somehow.
