Suppose that the distribution of typing speed in words per minute (wpm) for typists using a new type of split keyboard can be approximated by a normal curve with mean 60 wpm and standard deviation 15 wpm (The effects of Split Keyboard Geometry on Upper Body Postures," Ergonomics [2009]" 104-111). a. What is the probability that a randomly selected typist's net rate is at most 60 wpm? less than 60 wpm? b. What is the probability that a randomly selected typist's net rate is between 45 and 90 wpm?
Suppose that the distribution of typing speed in words per minute …
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