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63% of all people in the United States have at least some college education. If ten people were chosen at random, find the probability that exactly half have some college education.

Sagot :

Answer: 0.2417

Step-by-step explanation:

- 10! / (10-5)!5! x 0.53^5 x 0).47^5

To solve the problem we must know Binomial distribution.

The probability that exactly half have some college education is 17.3425%.

Given to us

  • The probability of a person having at least some college education = 63% = 0.63

To solve the problem we will use the Binomial distribution, therefore,

  • The probability of a person having at least some college education, p = 63% = 0.63
  • The probability of a person not having at least some college education, q = 37% = 0.37
  • Number of people selected for college education (Sample Size) = 10

Using the formula for Binomial Distribution,

We want the probability that exactly half have some college education, therefore, x = 5

[tex]P(x) = ^nC_x\ p^x\ q^{(n-x)}[/tex]

Substitute the values we get,

[tex]P(5) = ^{10}C_5\ (0.63)^{5}\ (0.37)^{(10-5)}\\\\P(5) = ^{10}C_5\ (0.63)^{5}\ (0.37)^{5}\\\\P(5) = 0.173425 = 17.3425\%[/tex]

Hence, the probability that exactly half have some college education is 17.3425%.

Learn more about Binomial distribution:

https://brainly.com/question/12734585

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