Explanation:
Mean and mode.
Mean is defined as follows:
\(\text{Mean}=\frac{\text{Sum of observation}}{\text{Number of observations}}\)
So, if we remove the extrema values that both sum and total number of observations will change. Hence, mean wiii aiso change.
Mode is that observation which occurs the most. So, if extreme value of those values which occurs mostly than mode can affect it they are removed.
Median is the mid value. So, if extreme values are removed than the mid value remains same. Hence, median will not change.