Question 144567
The average is the sum of all the scores divided by the number of students
either junior or senior.
Let sum of junior scores = {{{x[j]}}}
Let sum of senior scores = {{{x[s]}}}
Let aveage score for all {{{50}}} students = {{{a}}}
{{{x[j]/35 = 80}}}
{{{x[s]/15 = 70}}}
{{{x[j] = 35*80}}}
{{{x[s] = 15*70}}}
{{{a = (x[j] + x[s])/ 50}}}
{{{a = (35*80 + 15*70)/50}}}
{{{a = 2800 + 1050)/50}}}
{{{a = 3850/50}}}
{{{a = 77}}}
The average score for all 50 students was 77