Arranging the given data in ascending order, 6, 8, 10, 10, 15, 15, 15, 50, 80, 100, 120
= (6+8+10+10+15+15+15+50+80+100+120) / 11 = 429/11 = 39
Mode is the observation occurred the highest number of times = 15
Median is the middle observation = 15
Therefore, Mode and Median is 15. No, the mean, median and mode are not same.