In an average mass, each entry has equal weight. In a weighted average, we multiply each entry by a number representing its relative importance.
Assume that your class consists of 15 girls and 5 boys. Each girl has a mass of 54 kg, and each boy has a mass of 62 kg.
Average mass = (girl + boy)/2 = (54 kg + 62 kg)/2 = 58 kg
Weighted average (Method 1)
Use the numbers of each gender (15 girls + 5 boys) ,
Weighted average = (15×54 kg + 5×62 kg)/20 = (810 kg + 310 kg)/20
= 1120 kg/20 = 56 kg.
If you put all the students on one giant balance, their total mass would be
1120 kg and the average mass of a student would be 56 kg.
Weighted average (Method 2)
Use the relative percentages of each gender (75 % girls and 25 % boys).
Weighted average = 0.75×54 kg + 0.25×62 kg = 40.5 kg + 15.5 kg = 56 kg
Each girl contributes 40.5 kg and each boy contributes 15.5 kg to the weighted average mass of a student.
