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BlackBoard, now version 6, is a popular
software package for teaching over the
Internet. I am using its quiz and grade book
tools to supplement face-to-face interactions.
To my horror I discovered that while the mean
grade calculated by Blackboard (for any given
column) is correct the corresponding standard
deviation is much too small. It would be a
disaster if scores were turned into letter grades
by using their standard deviation. How comes
that such bug has not been discovered years
ago?