**Concept:**The question tests on the application of absolute value.

**Solution :**

Let the points be R,S,T and they have

**respectively.**__coordinates -a, b, c__

**r, s, t are the absolute values of the coordinates -a,b,c respectively.**With R being on the negative side of the number line would have,

r=|-a|= -(-a)

=>

**-a (the coordinate in context)= -r**s = |b| = b

t = |c| = c

Thus

**the coordinates -a,b,c in terms of r, s, t are -r, s ,t respectively.**Hence

**average of the coordinates -a, b, c = -r + s + t /3 (Option e)**Pls note that the question asks you of the average of the coordinates