To determine how many friends had a jump improvement of at least 1/2 inch, we need to look at the provided data:
- 1/2 inch: 1 friend
- 3/4 inch: 4 friends
- 1 inch: 1 friend
Now, we can summarize the total number of friends who had an improvement of at least 1/2 inch. This includes friends who had improvements of 1/2 inch, 3/4 inch, or 1 inch:
- 1/2 inch: 1 friend
- 3/4 inch: 4 friends
- 1 inch: 1 friend
Now, we add these numbers together:
1 (from 1/2 inch) + 4 (from 3/4 inch) + 1 (from 1 inch) = 6 friends
Thus, the number of friends who had a jump improvement of at least 1/2 inch is 6 friends.