A football team carried out a report to see the impact of stretching on preventing injury. Of the

28 footballers in the squad 21 stretch regularly. Of those who stretch, 3 got injured last year.

There was a total of 8 injured players last year.

The results can be presented in a frequency tree. What fraction of players who don't stretch

get injured?

Step-by-step explanation:

First, we need to know the number of player that don't stretch and the number of player that don't stretch and get injured.

So, the number of player that don't stretch are calculated as:

28 - 21 = 7

Because there are 28 footballers and 21 stretch regularly.

Additionally, the number of player that don't stretch and get injured are equal to:

8 - 3 = 5

Because there are 8 injured players and 3 of them stretch.

Finally, the fraction of players who don't stretch  that get injured are:

Because there are 7 players that don't stretch and 5 of them get injured last year.