Weighted mean (AQA GCSE Statistics): Flashcards
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10 cards from this deck
What is a weighted mean in statistics?
What is a weighted mean in statistics?
An average where values have different importance levels.
How do you calculate a weighted mean?
How do you calculate a weighted mean?
Use the formula: x̄ = Σ(wx) / Σw.
What does Σ(wx) represent in the formula?
What does Σ(wx) represent in the formula?
The total of each value multiplied by its weight.
What is the weighted mean of 2, 4, 6 with weights 1, 2, 3?
What is the weighted mean of 2, 4, 6 with weights 1, 2, 3?
Weighted mean = 4.0.
Why is the weighted mean useful in grading?
Why is the weighted mean useful in grading?
It reflects the importance of different assessments.
Calculate Jim's weighted mean: 10 (w=1), 20 (w=2).
Calculate Jim's weighted mean: 10 (w=1), 20 (w=2).
Weighted mean = 16.67.
What is a common mistake in weighted mean calculations?
What is a common mistake in weighted mean calculations?
Forgetting to multiply by weights before adding.
Convert marks: 40/50, 30/40 to percentages.
Convert marks: 40/50, 30/40 to percentages.
80%, 75% respectively.
What is the formula for calculating weighted mean?
What is the formula for calculating weighted mean?
Weighted mean = (Σ(wx)) / (Σw) where w = weights.
What should you check after calculating weights?
What should you check after calculating weights?
Ensure the total weights add up correctly.