PERCENTILE
1
STANDARD SCORE
STANDARD DEVIATION
-4.0
5
55
70
-3.0
-2.0
EXTREMELY
BELOW
AVERAGE
SIGNIFICANTLY
BELOW
AVERAGE
Skills in this area
are substantially
below most at the
same age/grade level
Skills in this area
are significantly
lower than most at the
same age/grade level
10
-1.5
BELOW
AVERAGE
Skills in this area
are lower than most
others at the same
age/grade level
20 30
40
50
60
70
80
90
95
99
85
100
115
130
145
-1.0
0
+1.0
+2.0
+3.0
AVERAGE
Skills in this area are similar to
others in the same age/grade level
Approximately 68% fall into this range
ABOVE
AVERAGE
Skills in this area
are higher than many
others at the same
age/grade level
+4.0
SIGNIFICANTLY
ABOVE
AVERAGE
EXTREMELY
ABOVE
AVERAGE
Skills in this area
are significantly
higher than most at
the same age/grade
level
Skills in this area
are substantially
above most at the
same age/grade level