The exams will not be handed back until Wednesday, but there is likely a lot
of anxiety over this one, so I thought I'd release the scores now (which are
available in Blackboard and expressed on a 60 point scale). Here are the grades
with conversions to a 100 point scale:

Grade |
60 point Scale |
100 Point Scale |

A | 48 - 60 | 80 -100 |

A- | 42 - 47 | 70 - 79 |

B+ | 39 - 40 | 64 - 69 |

B | 36 - 38 | 60 - 63 |

B- | 34 - 35 | 56 - 59 |

C+ | 30 - 33 | 50 - 55 |

C | 26 - 29 | 43 - 49 |

C- | 24 - 25 | 40 - 42 |

D | 18 - 23 | 30 - 39 |

F | < 23 | < 30 |

More than 50% of the class received a B- or better.

Here is a picture of the distribution:

Notice the depression in the distribution in the 50-59 range and the bunching at 40-44 (that is where the C- line is). Except for this feature, which always happens and was expected, the distribution isn't too bad. The bunching is caused by a binary outcome where people either know how to do a problem, or they are completely lost. This leads to difficulties in awarding partial credit, and that leads to bunching. The binary outcome itself, i.e. the fact that people either get it or they don't with little middle ground, mainly reflects difficulties in math that is learned outside of this course, e.g. not being able to carry out the algebraic manipulations to solve a system of equations, though that is not always the problem. In any case, this feature of the distribution is difficult to avoid.

One more note. I also added a "Running Weighted Total" to the listing in Blackboard. That is the percentage of the points to date weighted according to the weights in the final score for the course (the midterms and homework are each worth 20% of the final grade, so the weight is 1/3 for each).

I will have more to say about this on Tuesday.