Question

If your chemistry grade is broken down so that 70% of it is exams, 20% is a lab, and 10% is homework, and your average scores out of 100 points in each area are:

exams 85
labs 75
homework 96
Calculate your weighted average.

Answer 1

This should be fairly straightforward :)

Think about it like this:

Imagine you got perfect scores in each area.

Answer 2

ok

Answer 3

So you would want your weighted average in that case to equal 100, right?

Well it just so happens that we can do that if our equation is:

100*0.70 + 100 * 0.20 + 100 * 0.10

So just replace the 100s in that formula with the grades in the respective areas.

Answer 4

would i replace it with the 85 75 96?

Answer 5

would i replace it with the 85 75 96?

Answer 6

hello?

Answer 7

Yep.

You can also think of it like this.



The first line is 100%, the maximum total, right?
The second line represents weights of the areas, going into the total. They add up to 100%.

The third line is like, what you scored in each area, going into each weighted area, right? so 85% of 70%, plus 75% of 20%, etc. This should make sense if you think about it.

Then the last line represents the total score when you smoosh the blocks together, you know, when you add them up.