Exercise 3 solution

Bins of width 32: 96-127 contains 100, 110, 120 (3); 128-159 contains 130, 140, 150 (3); 160-191 contains 160, 170 (2). All other bins are empty.
Shape: a narrow cluster in the middle of the scale, nothing at either end, no clipping.
Suggests a low-contrast, mid-tone picture (for example a flat, overcast scene). Nothing is blown out or blacked out, though it may look dull; that is my interpretation, not the article's (check).