The Bouncy Ball Company (BBC) makes tennis balls whose diameters are normally distributed with mean 67 mm and standard deviation 1 mm. The tennis balls are packed and sold in cylindrical tins that each hold four halls. A tennis he" ts into such a tin it'the diameter ofthe ball is less than 63.5 mm. a. What is the probability. correct to four decimal places. that a randomly selected tennis ball produced by BBC ts into a tin? BBC management would like each bail produced to have diameter between 65.6 and 68.4 mm. b. What is the probability. canes: In four datum] places. that the diameter ofa randomly selected tmnis ball made by BBC is in this range?