To arrange the given numbers in order, let's sort them from the smallest to the largest:

Original sequence:
9, 5, 11, 6, 3, 12, 10, 11, 7, 3, 2, 2, 10, 10, 10, 12, 12, 8, 8, 8

Ordered sequence:
2, 2, 3, 3, 5, 6, 7, 8, 8, 8, 9, 10, 10, 10, 10, 11, 11, 12, 12, 12

Would you like to know more details or have any questions? Here are some related questions:

1. How do you find the median of a sequence of numbers?
2. What is the mode of this ordered sequence?
3. How can we calculate the mean (average) of this sequence?
4. What is the range of the numbers in this sequence?
5. How do you determine if a sequence has any outliers?

Tip: Sorting helps in easily identifying patterns, calculating the median, and finding the mode of a sequence of numbers!