Suppose that the distribution of net typing rate in words
Chapter 0, Problem 7.79(choose chapter or problem)
Suppose that the distribution of net typing rate in words per minute (wpm) for experienced typists can be approximated by a normal curve with mean 60 wpm and standard deviation 15 wpm (Effects of Age and Skill in Typing, Journal of Experimental Psychology [1984]: 345371). a. What is the probability that a randomly selected typists net rate is at most 60 wpm? less than 60 wpm? b. What is the probability that a randomly selected typists net rate is between 45 and 90 wpm? c. Would you be surprised to find a typist in this population whose net rate exceeded 105 wpm? (Note: The largest net rate in a sample described in the paper is 104 wpm.) d. Suppose that two typists are independently selected. What is the probability that both their typing rates exceed 75 wpm? e. Suppose that special training is to be made available to the slowest 20% of the typists. What typing speeds would qualify individuals for this training?
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