What does the phrase between 7.2 and 7.6 inclusive mean?

The phrase between 7.2 and 7.6 inclusive means:

7.2 ≤ x ≤ 7.6

The phrase gives you an interval where the extremes are included.

The intervals may be indicated in several ways. These are two of them:

1) [7.2; 7.6] ... you use square bracket when the extreme is included

2) 7.2 ≤ x ≤ 7.6