Answer is : (c) the median decreases
Let the given 11 distinct positive integers are in increasing order
x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, so x11,
is largest of these integers and the median is x6.
Now, median of first 10 numbers is
x6+x6/2 = m (Let)
Now, we have to replace largest number x11 by m and then increasing order will be
So, median decreases.