The median of a set of 9 distinct observations is P 20.5. if each o...

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The median of a set of 9 distinct observations is
P 20.5. if each of the largest 4 observations of the set

W 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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