26 lines
443 B
Markdown
26 lines
443 B
Markdown
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---
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title: Cumulative standard deviation
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---
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# Cumulative standard deviation
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---
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## Solutions
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<details><summary>Solution 1 (Click to Show/Hide)</summary>
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```javascript
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function standardDeviation(arr) {
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var sum = 0,
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sum_sq = 0,
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n = arr.length;
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arr.forEach(function(e) {
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sum += e;
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sum_sq += e * e;
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})
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var std_dev=Math.sqrt((sum_sq / n) - Math.pow(sum / n, 2))
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return Math.round(std_dev*1000)/1000;
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}
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```
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</details>
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