To find the median of a set of numbers, you first need to order the numbers from smallest to largest. The numbers you've provided are:
42, 90, 51, 930, 53, 910, 56, 630, 61, 50, 61, 220.
Now, let's sort them:
42, 50, 51, 53, 56, 61, 61, 90, 220, 630, 910, 930.
Since there are 12 numbers in total, the median will be the average of the 6th and 7th numbers in this ordered list.
- The 6th number is 61.
- The 7th number is also 61.
So, the median is:
\[ \text{Median} = \frac{61 + 61}{2} = \frac{122}{2} = 61. \]
Therefore, the median of the given numbers is 61.