Question 1033280
the weighted mean would be:


.15 * (73 + 80 + 85 + 88) + .4 * 88 = 84.1


by the distributive law of multiplication, this is equivalent to:


.15 * 73 + .15 * 80 + .15 * 85 + .15 * 88 + .4 * 88.


15% is equal to 15/100 = .15
40% is equal to 40/100 = .40