Eli says his average is about 90. His report card says 84. Nobody made a mistake, and by the end of this lesson you'll know how that's possible.
Not started yet.
By the end of this lesson your student should be able to find the mean, median and mode of a data set, handle an even-sized set and a set with no mode, and say which measure best describes the data.
🚨 Finding the median without putting the numbers in order first. The middle of the list as written is not the median.
With an even count, picking one of the two middle numbers instead of the number halfway between them.
Thinking a set must have a mode. No mode, and two modes, are both normal answers.
Have the student say out loud which measure he'd quote if he wanted his grades to sound good, and which one his teacher would use. The book's own example makes that point, and it sticks.
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Before You Start
The words this lesson uses. Tap a card to see what it means, then come back to them whenever a question uses one.
Part One
Questions about the story you just read. Pick your answer straight off, or press Find it in the story if you would rather hunt for the sentence first.
Part Two
The word cards are at the top of this page. Look back at them as often as you need, then answer.