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October 27th, 2015, 12:36 AM   #1
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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.
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October 27th, 2015, 06:26 PM   #2
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You need to clarify your symbolism. What is 5A*-C?
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October 28th, 2015, 12:17 AM   #3
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Quote:
Originally Posted by mathman View Post
You need to clarify your symbolism. What is 5A*-C?
5 of the grades belong to the set {A*, A, B, C}.
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October 28th, 2015, 07:54 PM   #4
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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.
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October 30th, 2015, 10:24 AM   #5
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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.
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October 30th, 2015, 11:00 AM   #6
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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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