How do you calculate an increase in odds of an event happening?

[Tap, tap, tap]

Lets make up a scenario:

I have a 1:100 (or 1%) chance of waking up with blue hair tomorrow.

if my mother has woke up with blue hair once then my odds increase by 2%.

How do you calculate the increase of 2%?

Do you add the percentages together to get 3% or do you add an additional 2%, of the 1%, to get 1.02% ?

[gardenschooler]

Ummm, is this gonna be on the test?

http://www.33smiley.com/smiley2/work/school/26.gif

(At least I bumped your thread, right? I'm not totally useless).

If your odds increase by 2%, that would be 2% of 100%, no? My guess is then it would be 3%. But we'll wait for someone who actually knows.

[pixelroper]

Not 2%? Guess I'll wait too:D

[Karen sn]

The odds increase TO 3%.
They increase BY 2%.
What exactly is the question again?

[Karen sn]

Wait - They increase BY 2%. OK. I get it. YOU ADD! So yes, you would have a 3% chance of waking up with blue hair if your mother woke up with blue hair.

[snickelfritz]

Right???

If there was a medical condition that had a basis in genetics....her outcome would affect you.

If it was faulty shampoo....her outcome would not affect you, unless you use the same shampoo.

Kind of like: the probability of having 3 girls is 1 in 8. But, if I already have 2 girls...the probability that the next pregnancy is a girl is still 1 in 2. The past history of girls has no affect on the outcome of the next pregnancy.

ETA: I'm probably making this too complicated. I have never been good at statistics.