00:01
So here we're given different components of the score.
00:03
We have the student score, we have the weight for one of them, and how to figure out what this what percentage of their grade than that is.
00:12
And we're asked to choose values for the remaining weights and find the necessary score on the final exam for a student to earn an a in the class if possible.
00:21
So first we have class participation, and this is the one given to us.
00:28
The student score is 92 percent, the weight is 0 .2 or 20 percent of their total score, and the score times weight we get 92 percent times 0 .2 which is 0 .92 times 0 .2.
00:47
To convert your decimals to percentages, multiply or divide them by 100, so we get 18 .4 percent.
00:59
Next we have homework, they got 95 percent of those points.
01:08
Next we have the midterm exam, they got 88 percent of those points, and then we have the final exam.
01:27
And we don't, we're figuring out what they need to get on that to get an a in the class.
01:31
So we're going to put the midterm exam at 0 .15, 15 percent of their grade.
01:38
These decimals in this column right here cannot be greater than one.
01:42
So one minus 0 .2 because we've taken that for class participation, leaves 0 .8 left.
01:47
We're taking 0 .15 for the midterm, so i've got 0 .65 left.
01:54
Homework, let's do, actually we're going to change the midterm and make that more of their grade.
02:00
Let's do homework at also 0 .2.
02:08
So we have 0 .6 left, we've used 0 .4 so far.
02:12
So let's do 0 .25 for the midterm, minus 0 .25, leaves us with 35 percent for the final or 0 .35.
02:25
And if i add this column up, 0 .2 plus 0 .2 plus 0 .25 plus 0 .35, i get one, and if i multiply that by 100, it's 100 for 100 percent.
02:36
Okay, so let's now figure out their score times weight in this final column.
02:42
So for the homework, we get 95 percent times 0 .2, so 0 .95 times 0 .2, and we get 19 percent.
02:53
For the midterm, we have 88 percent of 0 .25, so we get 22 percent, and we want at least a 90 percent in the class.
03:11
So just to get that 90 percent so far, 18 .4 plus 19 plus 22, so far 59 .4 percent.
03:23
So i'm going to scroll down a little bit so i can show my work...