QuestionSabine records the daily heights of a random sample of bamboo stalks, in inches. They are: $$20,19,17,16,18,15,20,21$$
Consider the formulas: $A: s^{2}=\frac{\left(x_{1}-\bar{x}\right)^{2}+\left(x_{2}-\bar{x}\right)^{2}+\ldots+\left(x_{n}-\bar{x}\right)^{2}}{n-1}$ $B: s=\sqrt{\frac{\left(x_{1}-\bar{x}\right)^{2}+\left(x_{2}-\bar{x}\right)^{2}+\ldots+\left(x_{n}-\bar{x}\right)^{2}}{n-1}}$ C $\sigma^{2}=\frac{\left(x_{1}-\mu\right)^{2}+\left(x_{2}-\mu\right)^{2}+\ldots+\left(x_{N}-\mu\right)^{2}}{N}$ $D: \sigma=\sqrt{\frac{\left(x_{1}-\mu\right)^{2}+\left(x_{2}-\mu\right)^{2}+\ldots+\left(x_{N}-\mu\right)^{2}}{N}}$
Which formula should you use for variance? $\square$ Which formula should you use for standard deviation? $\square$ DONE -