Answer:
The median is 70.
Step-by-step explanation:
I believe you may have mixed up median with mode.
Here are the definitions of both:
Mode - The value that appears the most in a data set
Median - The middle number in a list of numbers ordered from least to greatest
To find the median of this data set, we must arrange the numbers from least to greatest!
20, 20, 30, 50, 60, 70, 70, 80, 80, 90, 90
Now we just have to figure out the middle number...which is 70!
20, 20, 30, 50, 60, 70, 70, 80, 80, 90, 90
I hope this helps! Let me know if you have any other questions :D