Question $3[20]$

$3\mathrm{.}1$ Why variability is the enemy of manufacturing?

$(2).$

$3\mathrm{.}2$ How long will it take to complete $3$ operations with $2$ minutes downtime between operations when an operation that takes $10$ minutes takes up $10$ minutes of the available time of

a machine,

an operator,

or other resources.

Total operation time

$(2)$

Total downtime

$(4)$

Total required time

$(2)$

$3\mathrm{.}3$ State the five factory performance measures that are about time and define them.

$(10)$