Give Me Some Credit

So it has been a little more than a year since my house was broken into my electronics (and scriptures) were stolen.

I have had 'credit monitoring' since that point and I agreed I would do so for a while afterward to make sure nothing happened.

I looked at my credit report and it states my credit score and the reason for the score according to each of the credit bureaus.

With credit bureau A:

"Too few revolving bank accounts, too few retail accounts, too few satisfactory specialty retail accounts and too few bankcard accounts."

I have one credit card and two accounts linked to a card. So apparently that's bad.

With credit bureau B:
"Total available credit on recently reported open revolving accounts is too low, average time revolving accounts have been open is too short."

So I have a low credit amount on the most recently opened account (2-3 years ago) which is more than I'd like it to be anyway. My oldest 'revolving' account was 9 years ago so that means the average time would be 5 years.

With credit bureau C:
"Installment account balances too high in proportion to credit limits, total account balances are too high in proportion to credit limits, too few premium bank accounts."

I charge my expenses on one card and pay off 90% of it at the end of each month. And I have two bank accounts maybe one of which might be premium. Also, I'd imagine this takes my student loans into account. I can't pay those off for quite a while, it SHOULD be pretty high.

So what is a good credit score?

According to CreditReport.com (who knows how reliable this is)
Most scores range from 300 to 900, with the majority of people in the 600 to 800 range. To get the most favorable interest rates, you'll need a score of 720 or higher. In terms of interest rates, a person with a credit score of 520 will get interest rates on loans that are three to four percentage points higher than rates given to a person with a credit score of 720.

So, with what is listed above what do you think my average credit score is?