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🔬 Science - Class 9
Unit 1 · Scientific Study

The Importance of Taking the Average in Measurement Presentation

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Science and Technology, Class 9, Unit 1

Why We Take the Average

Repeat the reading · Find the average · Trust the result

What We Learn Today

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Why one reading alone cannot be trusted

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How the average is calculated

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What a precise measurement is

The Falling Marble Experiment

1
Fix a tin sheet on the floor
2
Drop a marble from 2 metres above
3
Record the time to strike the sheet
4
Repeat the drop three times

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Presenter notes: Open with one small question: if the same thing measured three times gives three different readings, which one is right? Ask the class to guess before moving on.