Grading Lingo?i Dont Get It!

So there will never be a 13 or 33 or 41. The numbers given are about it.

Grading then goes to:

Use the following formula, once you have assigned a numerical grade to the surface preservation, strike, lustre and eye-appeal of each side of a coin:
OBVERSE:
Surface Preservation (1-5) ____________ x2 = ______________
Strike (1-5) = ______________
Lustre (1-5) = ______________
Eye-appeal (1-5) = ______________

OBVERSE TOTAL: ______________

REVERSE:
Surface Preservation (1-5) ____________x2 = ______________
Strike (1-5) = ______________
Lustre (1-5) = ______________
Eye-appeal (1-5) = ______________

REVERSE TOTAL: ______________