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10 questions from this quiz
To reduce complexity and show patterns
The midpoint of an interval
80≤value<9080 \leq \text{value} < 9080≤value<90
They join with no gaps between them
On the horizontal axis at both ends
At zero at the bottom left corner
xˉ=∑xfn\bar{x} = \frac{\sum xf}{n}xˉ=n∑xf
s2=∑x2fn−xˉ2s^2 = \frac{\sum x^2f}{n} - \bar{x}^2s2=n∑x2f−xˉ2
s=s2s = \sqrt{s^2}s=s2
Loss of precision in calculations
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