A supplier of kerosene has a 150-gallon tank that is filled at the beginning of each week. His weekly demand shows a relative frequency behavior that increases steadily up to 100 gallons and then levels off between 100 and 150 gallons. If Y denotes weekly demand in hundreds of gallons, the relative frequency of demand can be modeled by f(y) = { y, 0 ≤ y ≤ 1
1, 1 < y ≤1.5
0, elsewhere.
Find
P(0 ≤ Y ≤ .5)