To answer your question, you're allowed to have averages/misses/boos, but only to a certain extent. Say for example, that the maximum raw score on a song is 23100. A score with 12 goods (and the rest perfects) would have a raw score of 23100 - (25*12) = 22800 so if the requirement was to get a score that was equivalent to 12 goods or better, you'd need to get a raw score of at least 22800. In order to help with this, I'll also post the equivalent raw score that you need to get for every round.
I'm going to borrow from
Dossar's Concise Guide To FFR Scoring Types to help illustrate how you can determine how many goods your score is equivalent to:
Quote:
Raw Scoring is the scoring type that is not affected by combo. Here is how it is calculated:
PERFECT = +50
GOOD = +25
AVERAGE = +5
MISS = -10
BOO = -5
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This guide by itself won't tell you directly "how many goods are equivalent to one average" since it doesn't take into account the opportunity cost of the points that you're missing out on when you
don't hit a perfect.
-For a good, you get a 25 points when you could have gotten 50 points for a perfect so you missed out on 25 points.
-Similarly for an average, you are missing out on 50-5 = 45 points
-For a miss, you miss the full 50 points for the perfect plus you get penalized 10 points for the actual miss for a total of 60 points that you're missing out on.
-You don't need to give up a perfect in order to get a boo, so you're just missing out on 5 points by hitting a boo.
Using this, we can calculate how much each judgement is in terms of goods in terms of the points that you're missing out on:
-1 good = 1 good
-1 average = (45 missed points)(1 good / 25 missed points) = 1.8 goods
-1 miss = (60 missed points)(1 good / 25 missed points) = 2.4 goods
-1 boo = (5 missed points)(1 good / 25 missed points) = 0.2 goods
Therefore, you're score is equivalent to getting X goods (with the rest perfects) where:
X = G + 1.8A + 2.4M + 0.2B
where G, A, M, and B are the number of goods, averages, misses, and boos in your score respectively.