GIH WR Distribution with SD-Based Grade Boundaries (263 ECL Cards)

Range: 45.3% - 66.9% | Mean: 55.60% | StdDev: 3.82% | Each grade step = 0.33 SD
A+
≥63.2%
A
62.0-63.2%
A-
60.7-62.0%
B+
59.4-60.7%
B
58.2-59.4%
B-
56.9-58.2%
C+
55.6-56.9%
C
54.3-55.6%
C-
53.0-54.3%
D+
51.8-53.0%
D
50.5-51.8%
D-
49.2-50.5%
F
<48.0%
Grade System (17 Lands Methodology): Grades are centered at C+ (mean = 55.60%), with each grade step representing 0.33 standard deviations (1.26%). This creates a distribution that assumes most cards cluster near C+, with progressively fewer cards toward the extremes. Vertical lines show exact grade boundaries.
Grade Boundaries (SD-Based System):
A+
+2.0 SD
≥63.86%
A
+1.67 SD
62.56-63.85%
B+
+1.34 SD
61.26-62.55%
B
+1.0 SD
59.92-61.25%
C+
+0.67 SD
58.62-59.91%
C+
0 SD
55.60%
D+
-0.67 SD
53.34-55.97%
D
-1.0 SD
52.04-53.33%
F
-1.67 SD
<49.4%
A+ (63.2%+)
Top tier - most consistent performers
A (62.0-63.2%)
Excellent cards, well above mean
B+ (59.4-60.7%)
Very strong playable cards
B (58.2-59.4%)
Above average, solid picks
C+ (55.6-56.9%)
At the mean (center)
C (54.3-55.6%)
Slightly below mean
D+ (51.8-53.0%)
Below average
D (50.5-51.8%)
Below average, niche picks
F (<48.0%)
Weak, rarely played cards