9. Find the area of the shaded region. The graph depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 A. 0.0999 B. 0.3255 C. 0.7045 D. 0.7936 10. Scores on an English test are normally distributed with a mean of 33.8 and a standard deviation of 8.5. Find the score that marks the bottom 41%. A. 31.866 B. 28.500 IC. 28.630 D. 35.407 11. The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter of at least 0.32 inches? A. 4.455% B. 5.000% C. 32.333% D. 2.275% 12. At one college, GPA's are normally distributed with a mean of 2.6 and a standard deviation of 0.4. What percentage of students at the college have a GPA greater than 3.0? A. 15.87% B. 30.15% C. 84.13% D. 69.85% Page