Hi,

Question is 4 out of 5 teens carry a wireless device.

If 3 teens are randomly selected, find the following probabilities:

A) - None of the teens have a wireless device. ANS is .2

B) - at least one has a wireless device ANS is .8

C) - all 3 have wireless devices. ANS is .512

A) I put 1/5 X 1/4 X 1/3 and I get .02 What did I do wrong?

B) I am not sure what to do here

C) I am not sure what to do here.

I am having trouble with stats and the teacher is not that good in explaining, so any help would be great, thanks.

Jo