Math Problem Statement
The percentage of American men who say they would marry the same woman if they had it to do all over again is 80%. What’s the probability that in a sample of 25,
exactly 17 would marry the same woman.
The probability is 0.499%
more than 22 would marry the same woman.
The probability is
at most 4 would marry the same woman.
The probability is
at least 20 would marry the same woman
The probability is
Solution
This is a problem involving binomial probability, where the probability of a given number of successes in a fixed number of trials can be computed using the binomial formula:
Where:
- is the sample size,
- is the probability of success (i.e., a man would marry the same woman again),
- is the number of successes (the specific number of men),
- is the binomial coefficient.
1. Probability that exactly 17 would marry the same woman:
We need to compute for a binomial distribution.
Calculating this:
Using a calculator or statistical software, this probability is approximately:
2. Probability that more than 22 would marry the same woman:
This is the probability , which is equivalent to .
We calculate these probabilities individually using the binomial formula.
Adding these values together will give us .
Using calculations, the probability .
3. Probability that at most 4 would marry the same woman:
This is , which is the sum of the probabilities for .
Summing these will give the probability .
The calculation gives , which is essentially 0%.
4. Probability that at least 20 would marry the same woman:
This is , which is the sum of .
Summing these gives .
Let me know if you'd like further details on any calculation!
Follow-up questions:
- How would the probabilities change if the sample size were increased to 30?
- How does the binomial distribution differ from other probability distributions like Poisson or normal?
- What is the difference between cumulative and individual probabilities in binomial distributions?
- How can these calculations be adjusted for a different probability of success?
- What is the relevance of the law of large numbers in relation to binomial distributions?
Tip:
In binomial probability, as the number of trials increases and the probability of success is moderate, the distribution tends to look more like a normal distribution.
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Math Problem Analysis
Mathematical Concepts
Probability
Binomial Distribution
Statistics
Formulas
P(X = k) = (n choose k) * p^k * (1 - p)^(n - k)
Binomial coefficient: (n choose k) = n! / (k!(n - k)!)
Theorems
Binomial Theorem
Law of Large Numbers
Suitable Grade Level
Grades 10-12
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