book Maths Puzzle Numerical Ability

Can you tell me if this is true or false
THe median of a data set is always one of the data values

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book Other Question

the conjugate of
sqare_root(2)-square_root(3) is:
square_root(2)+square_root(3).

But can it be:
-sqare_root(2)-square_root(3)? Find two consecutive positive integers such that the sum of their squares is 85.