Answer:
85
Step-by-step explanation:
60+60+70+80+85 = 355
355/5 = 71
mean= sum of the terms/ (over) number of terms
1, -1 , -3 ,3
The diameter is 12
37.68/3.14 = D π/ 3.14
D = 12 The diameter equals twelve.
9.7
