Mathematics Class 8
Tales by Dots and Lines
Find the mean as a balance point, then read a line graph honestly.
11 lessons · ~87 min total
Track progress — 0 of 11 lessons read 0%
Lessons in this topic
- 0 Start here A roadmap: the mean as a balance point, and two honest line graphs. · 4 min You are here
- 1 The mean is a balance point The mean is the one spot on a number line where numbers balance. · 8 min
- 2 The two sides always match Distances above the mean total the same as distances below it. · 9 min
- 3 Move one reading, move the mean A reading that moves shifts the mean by the move shared among all readings. · 8 min
- 4 A new reading joins the set A new reading pulls the mean up if it is above, down if below. · 8 min
- 5 Two groups, one true mean Two means average to the true mean when the counts match. · 9 min
- 6 When joining dots is allowed Join dots when the bottom scale runs in a real order. · 8 min
- 7 Steepness is a number Steepness is the change divided by the steps. A join cannot show what happened between readings. · 9 min
- 8 Two honest pictures, one truth Where a side scale starts changes how big a rise looks. · 9 min
- 9 The big picture Eight ideas, tied back together. · 6 min
- 10 Track quiz Cheat-sheet table plus a reveal quiz — one question per idea. · 9 min
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