The Daily Demand for Gasoline (In Millions of Gallons) in a City

Multiple Choice

The daily demand for gasoline (in millions of gallons) in a city is described by the probability density function $f ( x ) = \frac { 1 } { 5 } - \frac { 1 } { 50 } x$ over the interval $[ 0,10 ]$ . Find the probability that the daily demand for gasoline will be at least 3 million gallons.

A) 0.640
B) 0.360
C) 0.423
D) 0.562
E) 0.490