suppose that the distribution of typing speed in words per minute for experienced typists using a new type of split keyboard can be approximated by a normal curve with mean 60 wpm and standard deviation 15 wpm
a) suppose that two typists are independently selected what is the probability that both their speeds exceed 90 wpm
b) suppose that special training is to be made available to the slowest 15% of the typists what typing speeds would qualify individuals for this training
