Posted by **Joe** on Tuesday, October 23, 2012 at 10:03pm.

In practical use, oral contraceptives have a 5% chance of failing. If a doctor has 10 patients using oral contraceptives, what is the probability that at least 1 will get pregnant?

- Statistics -
**MathGuru**, Thursday, October 25, 2012 at 6:40pm
Here's one way to do this problem:

n = 10

p = .05

q = 1 - p = 1 - .05 = .95

You will need to find P(0). You can then take 1 - P(0) for your probability, which is easier than finding P(1) through P(10).

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

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

I'll let you take it from here.

## Answer This Question

## Related Questions

- Statistics - Many women take oral contraceptives to prevent pregnancy. Under ...
- AP euro - 5. [AP audit] In the 1960s, Western European women's lives were ...
- Math- Statistics - An epidemiologist is planning a study on the prevalence of ...
- Statistics - Bart is taking two classes, backpacking and biology. His ...
- Government Help Please - All of the following statements regarding the process ...
- Oral presentation - My teacher gave us a sonnet and he said that we have to do ...
- Grammar - The patient had been on oral contraceptives until 2006; she stopped ...
- gammar - The patient had been on oral contraceptives until 2006; she stopped the...
- statistics - In testing a new drug, researchers found that 10% of all patients ...
- 2nd grade oral report - My daughter is eight years old and in 2nd grade. She has...

More Related Questions