' weather forecaster predicts that the May rainfall in a local area will be between three and six inches but has no idea where within he interval the amount will be. Let x be the amount of May rainfall in the local area, and assume that x is uniformly distributed over the interval three to six inches. [a] Write the formula for the probability curve of x. {b} What is the probability that May rainfall will be at least four inches? At least ve inches? {Round your answers to 4 decimal places} PD: 2 4} PD: 2 5}