Hello bookbaby84Welcome to Math Help Forum!

I don't think there is a unique answer to this question, unless we have some more information. Let me tell you what I have so far.

The mean = 5. So the total number of fish caught = 7 x 5 = 35.

The median = 4. So, when we arrange the numbers of fish caught in order of size, the middle number is 4.

The mode = 3. So, in our list, 3 occurs more than any other number; in other words, there must be at least two 3's.

That means that the numbers will look like this: *, 3, 3, 4, *, *, *

Now the numbers we have found so far add up to 10. So the remaining numbers add up to 25. And there are lots of possibilities...

1, 3, 3, 4, 5, 6, 13

1, 3, 3, 4, 5, 7, 12

...you get the idea.

Grandad