65, 74, 54, 63, 45, 44, 65, 68, 87, 56, 67, 62, 49, 52, 68,71, 57, 64, 67,40
The digit in the place is the best stem value
for the set of data shown above.

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

X= 49; x = 4step 1: foilstep 2: equal both to 0step 3: find x individually