Calculate my best friend grades (urgent plz)

[Hannah-5]

Dear all,

Please we need urgent help as we have been trying to work this out with no luck.

My friend lecturer -personal advisor- said first year equal 1:7 of final grade, second equal 2:7 of final and third equal 4:7 of final year. Each subject is out of 200. -please check below.

While another senior lecturer emailed her back this evening to say first year worth 10% second 30% and final year 60%.


We trying to work out how much she has in total NOW and if she in total of 800 got 449 in first year and out of 800 got 444 in second year, how much she needs to get in this year in total out of 800 to achieve 60% overall.

We just cheking the chances of her getting 60% over all. By knowing how much she needs to achieve out of 800 in this year, so we can work out by dividing it to 8 how much at least she needs in each subject. We please need to know how much she needs in both scenarios the 1:7, 2:7, 4:7th and the 10%, 30%, 70% respectively.

Please let us how you got it so we can convince her it is right!

Many thanks guys,
Hannah

 

[wjm11]

My friend lecturer -personal advisor- said first year equal 1:7 of final grade, second equal 2:7 of final and third equal 4:7 of final year. Each subject is out of 200. -please check below.

While another senior lecturer emailed her back this evening to say first year worth 10% second 30% and final year 60%.


We trying to work out how much she has in total NOW and if she in total of 800 got 449 in first year and out of 800 got 444 in second year, how much she needs to get in this year in total out of 800 to achieve 60% overall.

We just cheking the chances of her getting 60% over all. By knowing how much she needs to achieve out of 800 in this year, so we can work out by dividing it to 8 how much at least she needs in each subject. We please need to know how much she needs in both scenarios the 1:7, 2:7, 4:7th and the 10%, 30%, 70% respectively.

1/7 = 14.286% vs 10% for first year;
2/7 = 28.571% vs 30% for second year;
4/7 = 57.143% vs 60% for third year.

The 10%, 30%, 60% system makes the 2nd and 3rd years count more heavily than the 1/7, 2/7, 4/7 system does, so let’s examine that system first.

This is known as a “weighted” grading system. The 10%, 30%, and 60% are the “weights” applied to the scores achieved each year. A perfect score of 800 every year would look like this:

(.1)800 = 80
(.3)800 = 240
(.6)800 = 480
Total (perfect) score for all three years equals 800 “weighted” points.

So far, your friend has scored:

(.1)449 = 44.9
(.3)444 = 133.2

Total points so far = 178.1 “weighted” points. The goal of 60% over all means (.6)800 = 480 “weighted” points. That means she needs 480 – 178.1 = 301.9 “weighted” points her third year. The maximum possible “weighted” points in the third year is 480, so your friend needs 301.9/480 = .629 (62.9%) of all the possible points.

Another way of saying this is that (.629)800 = 503.2 (unweighted) points are needed.

The 1/7, 2/7, 4/7 system would look like this:

(1/7)800 = 114.29
(2/7)800 = 228.57
(4/7)800 = 457.14
Total (perfect) score for all three years equals 800 “weighted” points (the same as before).

So far, your friend has scored:

(1/7)449 = 64.14
(2/7)444 = 126.86

Total points so far = 191 “weighted” points. The goal of 60% over all means (.6)800 = 480 “weighted” points. That means she needs 480 – 191 = 289 “weighted” points her third year. The maximum possible “weighted” points in the third year is 457.14, so your friend needs 289/457.14 = .632 (63.2%) of all the possible points.

Another way of saying this is that (.632)800 = 505.8 (unweighted) points are needed.

In summary, 506 points are needed in the third year to achieve the 60% goal using either weighting system.