You have 16 numbers...... list them in increasing order
add them all then divide the sum by 16 to find the MEAN (= average)
the MEDIAN is the number in the MIDDLE of the list
there really is no MIDDLE number....so take the TWO middle numbers, add them then divide by 2 to find the MEDIAN
The MODE is the number that occurs the most often in the list of numbers...... give it a try !