WAEC - Further Mathematics (2020 - No. 30)
Calculate the variance of \(\sqrt{2}\), (1 + \(\sqrt{2}\)) and (2 + \(\sqrt{2}\))
0
\(\sqrt{\frac{2}{3}}\)
\(\frac{2}{3}\)
2
설명
| x | (x - \(\bar{x}\)) | (x - \(\bar{x}\)) |
|
\(\sqrt{2}\) 1 + \(\sqrt{2}\) 2 + \(\sqrt{2}\) |
-1 0 1 |
1 0 1 \(\overline{2}\) |
variance = \(\frac{\sum(x - \bar{x})^2}{n}\)
= \(\frac{2}{3}\)