There are slips of paper that are numbered from 1 to 15 in a hat. what is the theoretical probability that a slip of paper that is chosen will be an even number?

1/15
7/15
1/2
8/15

There are 7 even numbers between 1 and 15 so the answer will be 7/15

Hope this helps :)

Okay! Let's write out all the numbers: 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

Now, let's bold (or you can circle them... or do really anything to them as long as they are standing out to you) the even numbers (remember all even numbers are divisible by 2)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

Now let's list all the ones we highlighted: 
2
4
6
8
10
12
14

Count up how many numbers that is. 
You should get 7. 

So, our answer is 7 out of 15 numbers. 
Or as a fraction: 

7/15 is our answer.

Note: A probability is the number of chances something has to happen out of the total number of chances. So in this case the number of even numbers out of the total number of numbers. You can apply this to any probability problem. Hope this helps!