A sporting goods store received an order of 90 baseball caps, of which 18 of them were green. What is the probability it will not be green? I know it is 80% but what is the work to get to the answer.

Question

photon336 · Answer

$$probability~of~event~A~not~happening = 1-\frac{ 18~green~caps }{ total~number~of~caps }$$

plainntall · Answer

There are a total of 90 baseball hats, 18 are green, 72 are not

mikimarie · Answer

Oh I forgot to add the important part of the question, 1 of the 90 caps is selected at random what is the probability it willnot be green? My teacher says 80%

plainntall · Answer

As Photon336 pointed out 
P=number of chances something could happen/ total number of possible outcomes

mikimarie · Answer

I think I'm confusing myself. I have to show my work so how would it look? Sorry I feel dumb but when I do what photon said I don't get 80%

plainntall · Answer

You don't get .8 or 80% from (1-18/90)?

mikimarie · Answer

No I did. I don't know what I was doing yesterday lol........

plainntall · Answer

mikimarie has a bag with 8 sugary treats and 2 bottles of highly caffeinated beverages.  What are the chances mikimarie will be awake enough to do their homework?

10 total opportunities 2 of them have caffeine so a 2/10  or 20% chance, 8/10 or 80% chance of a sugar crash and slumber. :D

mikimarie · Answer

LOL nice and true ;)