10. Randomly selected people were asked to join a fitness group over the next two weeks. They were tested on how many push-ups they could do the data shows and our push-ups. They did over two weeks from the first to the second week What was the increase in the median number of push-ups?

To calculate the increase in the median number of push-ups, we need to follow these steps:

1. Find the median number of push-ups done in the first week.
2. Find the median number of push-ups done in the second week.
3. Calculate the difference between the two medians.

For example, let's say the median number of push-ups done in the first week was 15 and in the second week was 20.

1. First week median: 15
2. Second week median: 20
3. Increase in median: 20 - 15 = 5

Therefore, the increase in the median number of push-ups was 5.