SOLUTION: can someone help me with this If 5 apples in a barrel of 25 apples are rotten, what is the expected number of rotten apples in a sample of 2 apples? a. .4 c. .63 c. .33 d.

Algebra ->  Probability-and-statistics -> SOLUTION: can someone help me with this If 5 apples in a barrel of 25 apples are rotten, what is the expected number of rotten apples in a sample of 2 apples? a. .4 c. .63 c. .33 d.      Log On


   

Question 162667: can someone help me with this
If 5 apples in a barrel of 25 apples are rotten, what is the expected number of rotten apples in a sample of 2 apples?
a. .4
c. .63
c. .33
d. 1
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
Use a ratio
Ask yourself, 5 is to 25 as x is to 2. then solve for x
5%2F25+=+x%2F2
10%2F25+=+x
0.4+=+x
Not sure how you get 0.4 apples, but that is what the math tells you. So in this case, you would have to do a little more thinking. There is no way to get 0.4 apples rotten. You either have a rotten apple or you don't. So, if you were asked, how many rotten apples do you 'expect' to find in a sample of two apples, your 'best bet' would be "none". You might actually have none, 1 or even 2. But the odds tell you, 0 is most likely based on the info you have handy.