Posted by **nathalie** on Tuesday, May 22, 2012 at 3:52am.

suppose 25% of the urban population is 18 years old or younger. five residents of that city are selected at random find the probability that at least two of the selected five persons are 18 years old or younger. please help me with this question !!!

- statistics -
**MathGuru**, Tuesday, May 22, 2012 at 5:36pm
Here's one way to do this problem:

n = 5

p = .25

q = 1 - p = 1 - .25 = .75

You can do this: you can find P(0) and P(1), add both values together, then subtract from 1.

You can use a binomial probability table, or calculate by hand using the following formula:

P(x) = (nCx)(p^x)[q^(n-x)]

I hope this will help.

## Answer This Question

## Related Questions

- finite math - The probability that a 3-year old garter snake will reach 4 years ...
- finite math - The probability that a 3-year old garter snake will reach 4 years ...
- finite math - The probability that a 3-year old garter snake will reach 4 years...
- algebra - A person is 3 times as old as aonther person but in 15 years she will ...
- statistics - Sweden is reported to have among the highest percentage of citizens...
- statistics - A study was conducted to count the different age groups of kids ...
- statistics - A study was conducted to count the different age groups of kids ...
- statistics - Based on data from a statistical abstract, only about 12% of senior...
- college math - biostatistics - hey... first time user and really lost. wondering...
- stats - research shows that 14.3% of persons 20-25 years old and 59.9 % of ...

More Related Questions