Exam Statistics
Lesson 1 of 1
  1. 1
    Let's look at those grades!
    Creating a program to compute statistics means that you won’t have to whip out your calculator and manually crunch numbers. All you’ll have to do is supply a new set of numbers and our program does…
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  2. 2
    Print those grades
    As a refresher, let’s start off by writing a function to print out the list of grades, one element at a time.
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  3. 3
    Review
    So far, you’ve created a helper function that will be used in the next sections. You also have a solid handle on the concepts that we’ll need to continue. The next step in the creation of our gr…
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  4. 4
    The sum of scores
    Now that we have a function to print the grades, let’s create another function to compute the sum of all of the test grades. This will be super-helpful when we need to compute the average score. …
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  5. 5
    Computing the Average
    The average test grade can be found by dividing the sum of the grades by the total number of grades. Luckily, we just created an awesome function, grades_sum to compute the sum.
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  6. 6
    Review
    Great work creating the capability to compute the average of the test grades. We’re going to use the average for computing the variance. The variance allows us to see how widespread the grades wer…
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  7. 7
    The Variance
    Let’s see how the grades varied against the average. This is called computing the variance. A very large variance means that the students’ grades were all over the place, while a small variance …
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  8. 8
    Standard Deviation
    Great job computing the variance! The last statistic will be much simpler: standard deviation. The standard deviation is the square root of the variance. You can calculate the square root by raisi…
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  9. 9
    Review
    You’ve done a great job completing this program. We’ve created quite a few meaningful functions. Namely, we’ve created helper functions to print a list of grades, compute the sum, average, varian…
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