To find the mean, add all the numbers, then divide by the amount of numbers there are. I'll do the first one as example.
6+5+6+9+9+11=46.
46 divided by 6 = 7.66
To find the median, put all the numbers in order from biggest to smallest.
5, 6, 6, 9, 9, 11.
Since there is an even amount of numbers, you have to add the two middle numbers (6,9) and divide by two.
6+9= 15
15 divided by 2 = 7.5
To find the mode, you just have to find the most common number. In this case, there are two most common numbers (6,9) so the answer would be both.
5,6,6,9,9,11
Answer:
Mean: 7.66
Median: 7.5
Mode: 6,9
