Figure 7-5. Page 191 Figure 7-14 Box 7-3 Figure 7-15.
Average = 112.4 = C+ Standard deviation = 16 A = 131+B- = 113-117 A- = 126-130 C+ = 109-112 B+ = 122-125 C = 96-105 B= 118-121 C- = 85-95.