Question 1062686
How big the class is does not
change the problem, so I'll say
there are {{{ 300 }}} people in the class
{{{ 300/2 = 150 }}} got {{{ 90 }}}
{{{ 300/3 = 100 }}} got {{{ 87 }}}
{{{ 300/6 = 50 }}} got {{{ 89 }}}
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[ average ] = [ total of scores ] / [ number of people ]
Average = {{{ ( 150*90 + 100*87 + 50*89 ) / 300 }}}
Average = {{{ (  13500 + 8700 + 4450 ) / 300 }}}
Average = {{{ 26650 / 300 = 88.833 }}}
88.833 %
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