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math: use sturges' formula

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eggy 2020-10-24 19:40:03 -04:00
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@ -54,7 +54,7 @@ A **frequency distribution** is a table that lists categories/ranges and the num
A frequency distribution table includes:
- A number of classes, all of the same width.
- This number is arbitrarily chosen, but a commonly used formula is $\lceil\sqrt{\text{# of elements}}\rceil$.
- This number is arbitrarily chosen, but a commonly used formula is $\lceil1+3.3\log({\text{# of elements})}\rceil$.
- The width (size) of each class is $\lceil\frac{\text{max} - \text{min}}{\text{# of classes}}\rceil$.
- Each class includes its lower bound and excludes its upper bound ($\text{lower} ≤ x < \text{upper}$)
- The **relative frequency** of a data set is the percentage of the whole data set present in that class in decimal form.