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.
<em>Average mass</em> = (girl + boy)/2 = (54 kg + 62 kg)/2 = <em>58 kg</em>
<em>Weighted average (Method 1)
</em>
Use the <em>numbers of each</em> gender (15 girls + 5 boys)
,
Weighted average = (15×54 kg + 5×62 kg)/20 = (810 kg + 310 kg)/20
= 1120 kg/20 = <em>56 kg</em>.
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 <em>56 kg.
</em>
<em>Weighted average (Method 2)
</em>
Use the <em>relative percentages</em> of each gender (75 % girls and 25 % boys).
Weighted average = 0.75×54 kg + 0.25×62 kg = 40.5 kg + 15.5 kg = <em>56 kg</em>
Each girl contributes 40.5 kg and each boy contributes 15.5 kg to the <em>weighted average</em> mass of a student.
There are plenty of things that could fill in that blank. I'm going to go with land.
<em>Our garbage gets taken to the <u>land</u> fill.</em><em />
Answer:
B. A chemical formula that shows the relative number of each type of
atom in a molecule, using the smallest possible ratio
Explanation:
The empirical formula of a compound shows the relative number of each type of atom in a molecule and it uses the smallest possible ratio.
- It expresses the composition of the compound in the simplest whole number ratio of the atoms of the different elements that makes up the compound.
- To determine empirical formula of a compound , two pieces of information are needed;
- A. mass of each element in the compound
- B. Relative atomic mass of the constituent elements.
The movement of the blades represents wind energy.
The visible light that allows people to see where they are going describes light energy.
<h3 /><h3>What is a wind energy?</h3>
A wind energy is the energy that results from the blowing the wind.
The blowing of the wind causes the windmill blade to rotate converting kinetic energy into mechanical energy of the moving blades.
<h3>What is light energy?</h3>
Light energy is the energy that allows light to be visible to human eyes.
Thus, we can conclude that the movement of the blades represents wind energy.
The visible light that allows people to see where they are going describes light energy.
Learn more about wind and light energy here: brainly.com/question/11899573
H2O is the correct answer :)
