Step-by-step explanation:
You can get median by ordering increasing or decreasing order and find the midium data if the no. of data is even then you will take the mean of the 2 data.
9 , 11 , 11 , 16 , 16 , 20
so no. of data is 6 which is even so take the mean(average) of 11 and 16 .
(11+6) / 2 = 8.5
So the median is 8.5
And the mean of the data is
Mean = (11 + 11 + 9 + 16 + 16 + 20)/2
Mean = 83/2 = 41.5
So the mean is 41.5