The mode is the number that appears the most in the data set. In our data set, both 27 and 36 are seen twice, which is more than any other number in the set. Therefore our answer is A) 27 and 36.
The mode of a data set is the most frequently appearing number. (You can remember this by thinking: mOde = mOst)
So for his particular data set, you must analyze the terms to find which one/s are most frequently occurring. Both 27 and 36 are tied for first with occurring two times. All the other terms only appear once.
So, the mode of this set of data is actually two numbers, 27 and 36.