Rounding error reporting grades

[Tom Salyers]

Hi, all. 

We're getting an error when reporting grades back to our Blackboard VLE. We have one test* that has a possible 15 points. There are two instances where a student scoring a 13 is getting 12 reported back to Blackboard and a student getting a 14 is getting 13.99999 instead. 

What I'm trying to figure out is whether this is likely to be a problem with the test itself, something internal to Numbas, or somewhere in the reporting process when the grades get back to Blackboard. 

Has anyone experienced this and/or does anyone know where the problem might be? 

*I don't know if this is happening in any other tests. I'm waiting to hear back from the person who reported the issue.

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Tom Salyers, MBCS
Senior Education Developer/System Administrator

The University of Sheffield

[William Haynes]

I also see this occasionally with Blackboard, although I haven’t been able to detect a pattern.    Students sometimes report that their score in blackboard doesn’t agree with their score in Numbas.

Clicking the ‘report scores back’ always fixes the problem.

Will

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[Christian Lawson-Perfect]

I'm aware of this. I think it's a timing issue, to do with the way scores are cached. I'm going to look into it.

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