Arranging the given data in ascending order,
6, 8, 10, 10, 15, 15, 15, 50, 80, 100,120
Mean=Sum of observationsNumber of observations
=6+8+10+10+15+15+15+50+80+100+12011=42911=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.