The median of a set of 9 distinct observation is 20.5 . If each of the largest 4 observations of...

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The median of a set of 9 distinct observation is 20.5 . If each of the largest 4 observations of the set is increased by 2 , then the median of the new set
(1) is increased by 2
(2) is decreased by 2
(3) is two times the original median
(4) remains the same as that of the original set
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