Expected Value: 4 quarters, 4 dimes, 2 nickels; 1 coin drawn

[Angela123]

Assume that the drawer contains
10 coins: 4 quarters, 4 dimes, and 2 nickels.
One coin is randomly selected.

What is the expected value of the coin selected (in cents)?
I don't know where to begin on this problem. I tried doing: (4/10)*.25+(4/10)*.1+(2/10)*.05=$.15, but that's not the right answer.

 

[soroban]

Re: Expected Value

Hello, Angela123!

WHO said that you have the wrong answer?

Your answer is correct!

 

[Angela123]

Re: Expected Value

I see the problem. The online homework wanted me to enter just 15 since it said (in cents) but I kept trying to enter .15. Thanks for your help! I kept second guessing myself.