Prob. of exposure, of getting strep from family

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!

Re: Probability and Stats

Jolyn Hillen said:

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?

Click to expand...

Aren't those exactly the same statement?

Maybe you should review and post correctly.