Prob. of exposure, of getting strep from family

[Jolyn Hillen]

There is a 15% chance of getting strep if you are exposed to a person with strep. There's a 50% chance that your were exposed.

a. What is the probability that you will get strep?

b. Each person in your (4-person) family had a 50% chance of being exposed. What is the probablitilty that you will get strep?

I solved part a by taking 15/100 * 50/100 and got .075 or 7.5%. Is that right?

I am confused on how to do part b.

Thanks!

 

[pka]

Re: Probability and Stats

There is a 15% chance of getting strep if you are exposed to a person with strep.
There's a 50% chance that your were exposed.
a. What is the probability that you will get exposed?

Aren't those exactly the same statement?

Maybe you should review and post correctly.