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so 2020 has been a very difficult year covert hit and the International Baccalaureate had to cancel this exams how then were the students going to be given the grades for the two years of study well the plan was to use teacher predicted grades and coursework to be able to assign a grade to the students of course in order to make sure that there was a greater degree of accuracy the IB used a statistical method to determine what was the relationship between a particular schools teacher predictions the coursework attainment and the actual grades that students got it was using a statistical estimate and in doing so it preserved the world average or been slightly up the trouble was is that not every individual in an institution performs exactly according to a statistical change and so some students got a very big upset and were disappointed by dropping several grades across the six subjects that they took schools being unhappy about this wanted to know what was the formula that the IB had used to determine this final grade they haven't disclosed it except that a some teachers in Hong Kong had been working together and tried to reverse form this formula and calculate what was the formula that they were using chap called John Chu in Hong Kong has seemingly cracked the algorithm and this is what he claims the algorithm is in order to determine the scale total which is the overall mark out of 100 that a student got at a particular course it is a formula that's relatively simple it's a constant a multiplied by the percentage of the dicted great so any predictive gray / 7pv that percentage plus a constant be multiplied by a percentage of performance in the IE so it's thee which is the course work which is a moderated mark divided by the maximum mark in the in the course work plus a final constant now constants a and B are fixed for every particular subject in a certain time zone constant C is this unique to the school constant which is determined by how well they have done in the past both were predicting their grades but also in terms of student performance I'm not going to go into this video of how they have developed C because they're still being explored John and his his his friends are trying to figure out exactly how C was determined but it is constant for your school so let's take a look at see if we can work out using the school data the constants a B and C to do this you need to use the subject results and the subject component results that have been sent to you so here's the subject results we're going to be working with chemistry higher level you'll see that they are ranked in predictive grade order however that means that the students are in a quite a random order so these...