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October 27th, 2015, 12:36 AM  #1 
Newbie Joined: Oct 2015 From: Uk Posts: 2 Thanks: 0  Just a little curious and need help with my school probabilities
I have a few statistics about the results of my high school which are:  61% 5A*C  50% 5A*C (including English and maths)  10% of all grades being an A or an A*  21% achieved 10 or more GCSE's A*C. Not all this information may be useful. Make any assumptions where necessary. What I wanted to find out is, if my results are: 3A*, 4A, 2B, 3C, then what is the probability of achieving these results in this school. There are approximately 200 students in my year. 
October 27th, 2015, 06:26 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,641 Thanks: 625 
You need to clarify your symbolism. What is 5A*C?

October 28th, 2015, 12:17 AM  #3 
Senior Member Joined: Dec 2012 From: Hong Kong Posts: 853 Thanks: 311 Math Focus: Stochastic processes, statistical inference, data mining, computational linguistics  
October 28th, 2015, 07:54 PM  #4 
Global Moderator Joined: May 2007 Posts: 6,641 Thanks: 625 
61% 5A*C 61% of what (200 students?) Who is getting the 5 grades in that interval? Are there other grades? It would helpful if your statement was not so terse. 
October 30th, 2015, 10:24 AM  #5 
Newbie Joined: Oct 2015 From: Uk Posts: 2 Thanks: 0 
Yes 61 percent of 200. Everything is out of 200. I'm part of the 21 percent because I have 12 GCSE's. And I also make up a part of the 10 percent of a/a* because I have 7 of those. Last edited by skipjack; October 30th, 2015 at 10:51 AM. 
October 30th, 2015, 11:00 AM  #6 
Global Moderator Joined: Dec 2006 Posts: 19,968 Thanks: 1850 
The percentage you're asking for will be less than 21%, as you exceeded the minimum number of A*C grades for that category.


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curious, percentages, probabilities, results, school 
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