You have a type mismatch. You are defining "numbers" as an array of doubles. Then you are setting it to input.nextDouble() (which returns a double).
You want to do one of two things.
1) Define "numbers" as a double (not an array of doubles). In this case you probably want to change its name to something like "number".
2) Use "numbers" as an array. In this case in stead of saying "numbers = input.nextDouble();" you would say "number[ i ] = input.nextDouble();"
It seems to me you really want the first option (as this is the simplest way to make this program work).