So there are a few issues I can see:
1. The counter variable for your for loop (score) is the same variable you use to get input, rendering the counter useless.
2. The variable score has a scope restricted to the for loop and is therefore not accessible outside of it.
3. minimum and maximum are never declared as variables anywhere.
I suggest getting a single portion of this assignment working first such as getting input for the 10 scores (making sure they are between 0-100). After that move onto either min score, max score, or average. If the for loop ends up giving you some troubles there are always other types of loops so keep that in mind.
Perhaps go over this: The for Statement (The Java™ Tutorials > Learning the Java Language > Language Basics)
and this (just in case): The while and do-while Statements (The Java™ Tutorials > Learning the Java Language > Language Basics)
Forgot to mention you may want to look over java syntax rules as you have a lot of unnecessary curly braces.