The average reading speed of students completing a speed-reading course is 450 words per minute (wpm). If

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The average reading speed of students completing a speed-reading course is 450 words per minute (wpm). If the standard deviation is 70 wpm, find the z score associated with each of the following reading speeds.
a. 320 wpm
c. 420 wpm
b. 475 wpm
d. 610 wpm
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