Lesson 3

Explore

 

In Discover you looked at calculating a final mark when the scoring categories were assigned different percent values. To calculate the overall final mark, you needed to multiply each weighting, expressed as a decimal, by the percentage score in that category. When you add the weighted scores for each category, it results in the weighted mean.

 

Go to Weighted Mean: Example to see a detailed example of calculating a course final mark.

 

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In Lesson 1 you learned about the arithmetic mean. Recall that the arithmetic mean is the sum of all data values divided by the number of data items.

 

For a refresher of arithmetic mean, you may want to review Lesson 1.

 

Share 2

 

With a partner or in a group, compare how arithmetic and weighted means are calculated.

1. How are they the same? How do they differ?
2. When would you use weighted mean instead of arithmetic mean?

Save your responses in your course folder.