Question

Suppose that the distribution of typing speed in words per minute (wpm) for experienced typists using a new type of split keyboard can be approximated by a normal curve with mean 68 wpm and standard deviation 17 wpm. What is the probability that a randomly selected typist's speed is at most 68 wpm? What is the probability that a randomly selected typist's speed is less than 68 wpm? What is the probability that a randomly selected typist's speed is between 34 and 85 wpm? (Round your answer to four decimal places.) Would you be surprised to find a typist in this population whose speed exceeded 119 wpm? (Round your numerical value to four decimal places.) It would ---Select--- (be, not be) surprising to find a typist in this population whose speed exceeded 119 wpm because this probability is ________ , which is ---Select--- (very small, very large) . Suppose that two typists are independently selected. What is the probability that both their typing speeds exceed 102 wpm? (Round your answer to three decimal places.) 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? (Round your answer to the nearest whole number.) People with typing speeds of wpm and ---Select--- (above, below) would qualify for the training.

          Suppose that the distribution of typing speed in words per
minute (wpm) for experienced typists using a new type of split
keyboard can be approximated by a normal curve with
mean 68 wpm and standard
deviation 17 wpm.
What is the probability that a randomly selected typist's speed
is at most 68 wpm?
What is the probability that a randomly selected typist's speed
is less than 68 wpm?
What is the probability that a randomly selected typist's speed
is between 34 and 85 wpm? (Round your
answer to four decimal places.)
Would you be surprised to find a typist in this population whose
speed exceeded 119 wpm? (Round your numerical value
to four decimal places.)
It would  ---Select--- (be, not be) surprising to find
a typist in this population whose speed
exceeded 119 wpm because this probability is
________ , which is  ---Select--- (very small,
 very large) .
Suppose that two typists are independently selected. What is the
probability that both their typing speeds
exceed 102 wpm? (Round your answer to three decimal
places.)
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? (Round your answer to the nearest
whole number.)
People with typing speeds of  wpm
and  ---Select--- (above, below) would qualify for the
training.

Added by Jennifer C.

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