The number of units expected to be sold is uniformly distributed between 350 and 650. If (r) is a random number between 0 and 1, then what is the proper expression for sales?
a) (350 + r × (650 - 350))
b) (350 - r × (650 - 350))
c) (r × (650 - 350))
d) (350 ÷ r × (650 - 350))
