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## 八年级

### 课程: 八年级>单元 10

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# 概念检查：标准差

## 公式 (用于参考)

start text, S, D, end text, equals, square root of, start fraction, sum, start subscript, end subscript, start superscript, end superscript, open vertical bar, x, minus, x, with, \bar, on top, close vertical bar, squared, divided by, n, end fraction, end square root

## 第一部分

start color #e84d39, 7, end color #e84d39 替换为 start color #1fab54, 12, end color #1fab54，标准差怎样被改变了？

## 第四部分

### 第五部分

start text, S, D, end text, equals, square root of, start fraction, sum, start subscript, end subscript, start superscript, end superscript, open vertical bar, x, minus, x, with, \bar, on top, close vertical bar, squared, divided by, n, end fraction, end square root
start text, M, A, D, end text, equals, start fraction, sum, start subscript, end subscript, start superscript, end superscript, open vertical bar, x, minus, x, with, \bar, on top, close vertical bar, divided by, n, end fraction

### 第六部分

square root of, start fraction, sum, start subscript, end subscript, start superscript, end superscript, open vertical bar, x, minus, x, with, \bar, on top, close vertical bar, squared, divided by, n, end fraction, end square root

square root of, start fraction, sum, start subscript, end subscript, start superscript, end superscript, left parenthesis, x, minus, x, with, \bar, on top, right parenthesis, squared, divided by, n, end fraction, end square root