What is the mode for the data set? 27, 21, 24, 21, 26, 28, 25, 21, 27, 29, 24 21 24 25 27 none

When thinking of mode think mode most often

so the easiest why to see which is the most often

occurring number you can put the numbers in order smallest to largest

21,21,21,24,24,25,26,27,27,28,29

now go though the list and see which number showed the most

in this case 21 showed 3 times 24 showed 2 times and 27 showed 2 times 

so 21 was shown the most times therefor

21 is the answer

Hey, can you post the problem?