Let
x--------> the degree of difficulty of the dive
we know that
1) The highest and the lowest scores are dropped
so
highest scores=

lowest scores=

the remaining scores=
![[7.5, 8.0, 7.0, 7.5, 7.0]](https://img.qammunity.org/2015/formulas/mathematics/middle-school/ctv3upn0smm3s7dyqayaj0ietffrwe716v.png)
2) Find the total of the remaining scores
![=[7.5+8+7+7.5+7]\\ =37](https://img.qammunity.org/2015/formulas/mathematics/middle-school/44pentsenpolptcj5uazf2oyhan6jliyd1.png)
3) The total of the remaining scores is multiplied by the degree of difficulty of the dive
so

4) This product is multiplied by .6 to determine the final score
![[37*x]*0.6=77.7\\ 22.2*x=77.7\\ x=3.5](https://img.qammunity.org/2015/formulas/mathematics/middle-school/mejs96woqlx1myg2s90ylpf5j1zx7thraq.png)
therefore
the answer is
the degree of difficulty of the dive is
