A factory produces tennis balls whose weights follow a bell-shaped distribution with a mean of 2.06 ounces and a standard deviation of 0.04 ounces. According to the International Tennis Federation (ITF), the mass of an 'official' tennis ball must be in the range of 1.98-2.10 ounces. a. What proportion of the tennis balls produced by this firm will conform to the weight criterion as defined by the ITF? b. What proportion of the balls are too small to be used in official tournaments