You need to know the standard deviation to calculate percentiles.
mean is 500
s.d. is 79
1 s.d. = 67th percentile, etc.
The two-digit score is similar to the three digit, but a different mean and different standard deviation. On my mailing from the NBOME, they only listed the three-digit mean and s.d.
Important Note: The 2-digit scores reported on this page are equivalent to the 3-digit scores, and are NOT the same as the 2-digit Percentile Rank that appeared on your score report. Please click here for more information about how to properly interpret these scores.
So...it sounds like we get an actual percentile on the paper copy of the score report that gets mailed to us...but who knows..
Important Note: The 2-digit scores reported on this page are equivalent to the 3-digit scores, and are NOT the same as the 2-digit Percentile Rank that appeared on your score report. Please click here for more information about how to properly interpret these scores.
So...it sounds like we get an actual percentile on the paper copy of the score report that gets mailed to us...but who knows..
You need to know the standard deviation to calculate percentiles.
mean is 500
s.d. is 79
1 s.d. = 67th percentile, etc.
The two-digit score is similar to the three digit, but a different mean and different standard deviation. On my mailing from the NBOME, they only listed the three-digit mean and s.d.