Answer
(a)
heaviest is pumpkin
lightest is strawberry
(b)
The weight difference is 1809.5 pounds.
Work Step by Step
(a)
Heaviest is pumpkin because its weight contains the largest whole number.
Lightest is strawberry because it is the only one less than one pound.
(b)
$1810 - 0.5$ = 1809.5