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 X denotes weekly demand in hundreds of gallons, the relative frequency of demand can be modeled by f(x)=0 for x < 0
f(x)=x for 0≤xl≤1
f(x)=1/2 for 1 f(x)=0 for x>2

What value of z satisfies: P(−2