An instructor gives students a surprise quiz and records a mean grade of 12 points. What is

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An instructor gives students a surprise quiz and records a mean grade of 12 points. What is the new mean value if the instructor does each of the following?
(a) Adds 10 points to each quiz
(b) Subtracts 2 points from each quiz
(c) Doubles each quiz score
(d) Divides each quiz score in half
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Elementary Statistics

ISBN: 9780321225979

3rd Canadian Edition

Authors: Mario F. Triola

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