Please show calculations on how it's done. Thank you.
Sun Love grapefruit growers have determined that the diameters of their grapefruits are normally distributed with a mean of 4.5 inches and a standard deviation of 0.3 inches. If a grapefruit is selected at random, what is the probability that its diameter
a. is at least 4.14 inches?
b. will be between 4.8 adn 5.04 inches?