Liam measured 11 pencils to the nearest quarter-inch. Lengths (inches):
1¼, 1¼, ¼, ½, 1¾, 1¾, 1¼, 2½, 1¾, 1¾, 2½
Plot each length with an × above the number line:
a) How much longer is the longest than the shortest?
b) How many pencils were measured in all?