4. For each of the following intervals, give (1) the interval width, (2) the exact limits of the interval, and (3) the score limits and exact limits of the next higher interval (assume the scores are rounded to the nearest whole number or decimal place indicated unless otherwise specified):

(a) 10–14

(b) 20–39

(c) 2.50–2.74

(d) 1.0–1.9

(e) 30–40 (accurate to the nearest 10)