Warped Coin Probability: Flipping 5 Times - Find More Heads than Tails

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  • Thread starter Jameson
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In summary, the probability of getting more heads than tails when flipping a coin 5 times is 31.25%. The expected number of heads is 2.5 and the probability of getting exactly 2 heads is also 31.25%. The probability of getting more heads than tails when flipping a biased coin 5 times depends on the bias of the coin. The probability of getting an equal number of heads and tails when flipping a coin 5 times is 31.25%, but this is theoretical as it is impossible to get an exact equal number of heads and tails when flipping a coin an odd number of times.
  • #1
Jameson
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A warped coin has probability of 0.5 of landing Heads, probability of 0.4 of landing Tails, and probability 0.1 of landing on its Edge. It is flipped 5 times. What is the probability that more Heads occur than Tails?
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  • #2
Congratulations to the following members for their correct solutions:

1) anemone
2) MarkFL

Solution (from anemone):
The probability that more Heads occur than Tails

$\small=\text{P(5 Heads)}+\text{P(4 Heads 0 Tail 1 Edge)}+\text{P(4 Heads 1 Tail 0 Edge)}+\text{P(3 Heads 0 Tail 2 Edges)}+\text{P(3 Heads 2 Tails 0 Edges)}+\text{P(3 Heads 1 Tail 1 Edge)}$

$\;\;\small+\text{P(2 Heads 0 Tail 3 Edges)}+\text{P(2 Heads 1 Tail 2 Edge)}+\text{P(1 Heads 0 Tail 4 Edge)}$

$=0.5^5+\dfrac{0.5^4\cdot0.1\cdot5!}{4!}+ \dfrac{0.5^4\cdot0.4\cdot5!}{4!}+\dfrac{0.5^3\cdot0.1^2\cdot5!}{3!\cdot2!}+ \dfrac{0.5^3\cdot0.4^2\cdot5!}{3!\cdot2!}+\dfrac{0.5^3\cdot0.1\cdot0.4\cdot5!}{3!}+\dfrac{0.5^2 \cdot 0.1^3\cdot5!}{2!\cdot3!}+\dfrac{0.5^2\cdot0.4\cdot0.1^2\cdot5!}{2!\cdot2!}+\dfrac{0.5^1\cdot0.1^4 \cdot 5!}{4!}$

$=0.03125+0.03125+0.125+0.0125+0.2+0.1+0.0025+0.03+0.00025$

$=0.53275$
 

Related to Warped Coin Probability: Flipping 5 Times - Find More Heads than Tails

What is the probability of getting more heads than tails when flipping a coin 5 times?

The probability of getting more heads than tails when flipping a coin 5 times is 31.25%. This can be calculated by using the formula (nCr)*(p^r)*(q^(n-r)), where n is the number of flips, r is the number of heads, p is the probability of getting heads (0.5 for a fair coin), and q is the probability of getting tails (0.5 for a fair coin).

What is the expected number of heads when flipping a coin 5 times?

The expected number of heads when flipping a coin 5 times is 2.5. This can be calculated by multiplying the number of flips (5) by the probability of getting heads (0.5).

What is the probability of getting exactly 2 heads when flipping a coin 5 times?

The probability of getting exactly 2 heads when flipping a coin 5 times is 31.25%. This can be calculated by using the formula (nCr)*(p^r)*(q^(n-r)), where n is the number of flips, r is the number of heads (2), p is the probability of getting heads (0.5 for a fair coin), and q is the probability of getting tails (0.5 for a fair coin).

What is the probability of getting more heads than tails when flipping a biased coin 5 times?

The probability of getting more heads than tails when flipping a biased coin 5 times depends on the specific bias of the coin. If the bias is towards heads, the probability will be higher, and if the bias is towards tails, the probability will be lower. The formula (nCr)*(p^r)*(q^(n-r)) can still be used to calculate the probability, but the values of p and q will be different depending on the bias of the coin.

What is the probability of getting an equal number of heads and tails when flipping a coin 5 times?

The probability of getting an equal number of heads and tails when flipping a coin 5 times is 31.25%. This can be calculated by using the formula (nCr)*(p^r)*(q^(n-r)), where n is the number of flips, r is the number of heads (2.5), p is the probability of getting heads (0.5 for a fair coin), and q is the probability of getting tails (0.5 for a fair coin). However, in practical terms, it is impossible to get an exact equal number of heads and tails when flipping a coin an odd number of times, so this probability is theoretical.

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