$$

CPM $(0\%)$

$10\%$

$20\%$

$30\%$

$40\%$

Average

$25$

$25\mathrm{.}12$

$25\mathrm{.}89$

$27$

$28\mathrm{.}27$

SD

$0$

$1\mathrm{.}4$

$2\mathrm{.}4$

$3\mathrm{.}3$

$4\mathrm{.}3$

P$(28$ or more$)$

$0\%$

$1\mathrm{.}7$

$18\mathrm{.}8$

$36\%$

$50\mathrm{.}1$

$99\%$ Certain

$25$

$28\mathrm{.}27$

$31\mathrm{.}98$

$35\mathrm{.}5$

$39\mathrm{.}24$

$$

b$)$ For all of the results above, the average time for each activity is the same, regardless of the percentage.$$ But you should see clear patterns in how the results are affected.$$ What are these patterns and what does this say about the how variability affects how long a project might take?

$$