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Mean and Average

Mean and Average is the single number you get by adding values together and dividing by how many there are.

Think of it this way

Imagine four friends bring different numbers of cookies to a party. You pile all the cookies together, then deal them out equally so everyone gets the same amount. That equal share is the mean.

Explaining mean and average by grade level

Say a bus takes 5 minutes on one stop and 9 minutes on the next. Add those up to get 14. Split 14 into two equal parts and you get 7. That middle number, 7 minutes, is the average.

Projects that explore mean and average

Bus Route Segments and Travel Time

You ride a bus route for 23 school days and record travel time for each segment. Then you add those times and divide by 23 — that gives you each segment’s average. The calculation reveals a clear pattern: Fridays average over 33 minutes while Wednesdays average under 29 minutes. By calculating the average travel time and variation for each segment, you can see how a single number captures what is typical across dozens of trips.

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