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The median of a set of 9 distinct observations is 20.5. If each of the largest 4 observations in the set is increased by 2, then the median of the new set
 
Options:
A .  is increased by 2
B .  is decreased by 2
C .  is two times the original median
D .  remains the same as that of the original set
Answer: Option D
:
D
We know that median is found when we arrange the observations in ascending or descending order. And if the number of observations are odd then it is the n+12th term.
Since on arranging 9 observations 5th will be the median.
On changing 4 of any side won't affect the median and it'll remain same.

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