The mean of a set of 9 observations is 20.5 . If each of the largest 4 observations is increased...

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The mean of a set of 9 observations is 20.5 . If each of the largest 4 observations is increased by 2 , the median of new set is:
a. Same
b. Increased by 2
c. Decreased by 2
d. Decreased by 4
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