Question 1080686
S0 then the total score for the boys is,
{{{T[b]=10*70=700}}}
and for the girls,
{{{T[g]=15*60=900}}}
So all together,
{{{T=T[b]+T[g]}}}
{{{T=700+900}}}
{{{T=1600}}}
Now divide by the total number of students,
{{{mu=1600/(10+15)}}}
Work that out for the answer.