(a) Calculate the sample mean and sample standard deviation. Use the recipe above and show your work. You should land at $\bar{x} = 43$ and $s = 48.003$.
(b) Calculate $\bar{x} - s$, $\bar{x} + s$, $\bar{x} + 2s$, and $\bar{x} + 3s$.
On your histogram in exercise 1, on the bottom axis, draw a dot at $\bar{x}$ and these other four values.