Answer:
median: 110
given data set:
70, 80, 90, 90, 100, 100, 100, 110, 110, **median**, 110, 110, 120, 120, 120, 120, 130, 130, 140
there are total 18 data's
the median will be between 9th and 10th data.
9th --> 110
10th --> 110
median:
( 110 + 110 ) ÷ 2
110