What is the mean of consective whole numbers from 1to8?for 1to 20?for 1to 100?

Based on what i know about mean, this doesn't add up.

Hii1977 cleaner shrimp are a species of shrimp that clean parasites from other organisms. fish allow the shrimp to eat the parasites in their mouth. the shrimp get a source of nutrition. the relationship between the shrimp and the fish is this association indicates that for the smaill aneser arecommensal,mutualistic,or parasitic for the begger one the anser are the shrimp and fish benefit each other , the shrimp harm the fish, or the fish do not benetit from the shrimp

How many solutions does the nonlinear system of equations graphed bellow have?