The daily high temperature in a computer server room at the university can be modeled by a normal distribution with mean \(68.7^{\circ} \mathrm{F}\) and standard deviation \(1.2^{\circ} \mathrm{F}\). Find the probability that, on a given day, the high temperature will be

(a) between 68.3 and \(70.3^{\circ} \mathrm{F}\)

(b) greater than \(71.5^{\circ} \mathrm{F}\).