how can i calculate an average if the first number is only worth 15%, the 2nd 25%, the 3rd 25% and the 4th 35%?? its for my grades at school!! please help!
2007-07-25 10:22:48 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Let A-D be your grades in the order you listed them
0.15A + 0.25B + 0.25C + 0.35D = Final grade
2007-07-25 10:28:38 · answer #1 · answered by whitesox09 7 · 0⤊ 0⤋
it's called a weighted average. multiply weight times value (several times), add them up, divide by total weight. if your report card had 3 A's (worth 4), 2 B's (worth 3), and 1 C (worth 2), you'd compute [3(4) + 2(3) + 1(2)] / [3 + 2 + 1] = 20/6 = 3.67.
in this case, let 1st number be A, 2nd B, 3rd C, 4th D. you have
[15%(A) + 25%(B) + 25%(C) + 35%(D)] / 100%
plug in the values of ABCD.
2007-07-25 17:31:44 · answer #2 · answered by Philo 7 · 0⤊ 0⤋
The Average is the total divided by the number, in this case 100% divided by 4 = 25%.
2007-07-25 17:29:31 · answer #3 · answered by Brad B 2 · 0⤊ 0⤋
ok, this is quite simple
first, the number that is worth 15% we will assume is 80
multiply 80*.15
the 2nd we will assume is 90
multiply 90*.25
the 3rd we will assume is 75
multiply 75*.25
the 4th we will assume is 87
Multiply 87*.35
then add up the numbers you get, and you will have your average! Which in this case is : 83.7
2007-07-25 17:28:43 · answer #4 · answered by stephen r 3 · 0⤊ 1⤋