Below 70 accounts for 44%, and above 80 accounts for 20%. It is known that the median should be between 70 and 80, 50% should be less than or equal to the median, 44% should be less than 70, so 6% should be more than 70 and less than the median. 20% of them are over 80, so 30% should be over 80, so the median is 70+ 10× (6% ÷ 36%).