Assume, marks of 7 students in a subject is given out of 100
68 , 72 , 75,62,75,80,68 then,
avg = (sum of number/ total number ) * 100 = ((68+72+75+62+75+80+68) / 700) * 100 = 71.429
if given out of 150 then ,
avg = (sum of number/ total number ) * 150 = ((68+72+75+62+75+80+68) / 1050) * 150 = 71.429
A = average (or arithmetic mean)
n = the number of terms (e.g., the number of items or numbers being averaged)
x_{1} = the value of each individual item in the list of numbers being averaged