Math and Arithmetic
Statistics
Probability

# What is the probability of obtaining exactly six heads in seven flips of a coin given that at least one is a head?

###### Wiki User

The requirement that one coin is a head is superfluous and does not matter.

The simplified question is "what is the probability of obtaining exactly six heads in seven flips of a coin?"...

There are 128 permutations (27) of seven coins, or seven flips of one coin. Of these, there are seven permutations where there are exactly six heads, i.e. where there is only one tail.

The probability, then, of tossing six heads in seven coin tosses is 7 in 128, or 0.0546875.

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## Related Questions

### What is the probability of obtaining exactly seven heads in eight flips of a coin given that at least one is a head?

The probability of obtaining 7 heads in eight flips of a coin is:P(7H) = 8(1/2)8 = 0.03125 = 3.1%

### What is the probability of obtaining exactly four heads in five flips of a coin given that at least three are heads?

We can simplify the question by putting it this way: what is the probability that exactly one out of two coin flips is a head? Our options are HH, HT, TH, TT. Two of these four have exactly one head. So 2/4=.5 is the answer.

### What is the probability of obtaining exactly two heads in three flips of a coin given that at least one is a head?

The probability of obtaining exactly two heads in three flips of a coin is 0.5x0.5x0.5 (for the probabilities) x3 (for the number of ways it could happen). This is 0.375. However, we are told that at least one is a head, so the probability that we got 3 tails was impossible. This probability is 0.53 or 0.125. To deduct this we need to divide the probability we have by 1-0.125 0.375/(1-0.125) = approximately 0.4286

### What is the probability of obtaining exactly three heads in four flips of a coin given that at least two are heads?

Pr(3H given &gt;= 2H) = Pr(3H and &gt;= 2H)/Pr(&gt;=2H) = Pr(3H)/Pr(&gt;=2H) = (1/4)/(11/16) = 4/11.

### What is the probability of exactly three heads in four flips of a coin given at least two are heads?

If you know that two of the four are already heads, then all you need to find isthe probability of exactly one heads in the last two flips.Number of possible outcomes of one flip of one coin = 2Number of possible outcomes in two flips = 4Number of the four outcomes that include a single heads = 2.Probability of a single heads in the last two flips = 2/4 = 50%.

### What is the probability of obtaining tails and a three?

Assume the given event depicts flipping a fair coin and rolling a fair die. The probability of obtaining a tail is &frac12;, and the probability of obtaining a 3 in a die is 1/6. Then, the probability of encountering these events is (&frac12;)(1/6) = 1/12.

### What is the probability of obtaining exactly four tails in five flips of a coin given that at least three are tails?

The probability is that the remaining two outcomes are 1 H and 1 T. The probability of that is 2/4 or 50%The probability is that the remaining two outcomes are 1 H and 1 T. The probability of that is 2/4 or 50%The probability is that the remaining two outcomes are 1 H and 1 T. The probability of that is 2/4 or 50%The probability is that the remaining two outcomes are 1 H and 1 T. The probability of that is 2/4 or 50%

### What is the probability of obtaining exactly three heads in four flips of a coin given that at least one is a head?

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### What is the probability of obtaining exactly five heads in six flips of a coin given that at least one is a head?

The probability that you will toss five heads in six coin tosses given that at least one is a head is the same as the probability of tossing four heads in five coin tosses1. There are 32 permutations of five coins. Five of them have four heads2. This is a probability of 5 in 32, or 0.15625. ----------------------------------------------------------------------------------- 1Simplify the problem. It asked about five heads but said that at least one was a head. That is redundant, and can be ignored. 2This problem was solved by simple inspection. If there are four heads in five coins, this means that there is one tail in five coins. That fact simplifies the calculation to five permutations exactly.

### You toss 3 coins What is the probability that you get exactly 2 heads given that you get at least one head?

you toss 3 coins what is the probability that you get exactly 2 heads given that you get at least one head?

### 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)

### What is the probability of obtaining exactly four tails in five flips of a coin if at least three are tails?

We need to determine the separate event. Let A = obtaining four tails in five flips of coin Let B = obtaining at least three tails in five flips of coin Apply Binomial Theorem for this problem, and we have: P(A | B) = P(A &cap; B) / P(B) P(A | B) means the probability of "given event B, or if event B occurs, then event A occurs." P(A &cap; B) means the probability in which both event B and event A occur at a same time. P(B) means the probability of event B occurs. Work out each term... P(B) = (5 choose 3)(&frac12;)&sup3;(&frac12;)&sup2; + (5 choose 4)(&frac12;)4(&frac12;) + (5 choose 5)(&frac12;)5(&frac12;)0 It's obvious that P(A &cap; B) = (5 choose 4)(&frac12;)4(&frac12;) since A &cap; B represents events A and B occurring at the same time, so there must be four tails occurring in five flips of coin. Hence, you should get: P(A | B) = P(A &cap; B) / P(B) = ((5 choose 4)(&frac12;)4(&frac12;))/((5 choose 3)(&frac12;)&sup3;(&frac12;)&sup2; + (5 choose 4)(&frac12;)4(&frac12;) + (5 choose 5)(&frac12;)5(&frac12;)0)

### The Information Commons in the main library has 150 personal computers The probability that any one of them will require repair on a given day is 0.02 To find the probability that exactly 25 of the?

I will assume that you meant to ask what the probability is that exactly 25 of the computers Will require repair on a given day. This can be found by doing binompdf(150, .02, 25). This is a VERY small number (&asymp;5.25*10^-16).

### What is the meaning of random variable in probability distribution?

It is a variable that can take a number of different values. The probability that it takes a value in any given range is determined by a random process and the value of that probability is given by the probability distribution function.It is a variable that can take a number of different values. The probability that it takes a value in any given range is determined by a random process and the value of that probability is given by the probability distribution function.It is a variable that can take a number of different values. The probability that it takes a value in any given range is determined by a random process and the value of that probability is given by the probability distribution function.It is a variable that can take a number of different values. The probability that it takes a value in any given range is determined by a random process and the value of that probability is given by the probability distribution function.

### How does one find the probability of A given B compliment?

P(A given B')=[P(A)-P(AnB)]/[1-P(B)].In words: Probability of A given B compliment is equal to the Probability of A minus the Probability of A intersect B, divided by 1 minus the probability of B.

### What atmost means in probability?

all probabilities smaller than the given probability ("at most") all probabilities larger than the given probability ("at least")

### What is theoretical probability mathematical wise?

Theoretical probability:Theoretical probability is when you decide what is the probability of something using the information that is given to you!

### The probability of event A occurring given event B has occurred is an example of?

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### What is the probability that exactly two times head are being tossed?

The answer depends on how many times the coin is tossed. The probability is zero if the coin is tossed only once! Making some assumptions and rewording your question as "If I toss a fair coin twice, what is the probability it comes up heads both times" then the probability of it being heads on any given toss is 0.5, and the probability of it being heads on both tosses is 0.5 x 0.5 = 0.25. If you toss it three times and want to know what the probability of it being heads exactly twice is, then the calculation is more complicated, but it comes out to 0.375.

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