You are managing a project to create a life$-$saving medication. The active ingredient for the drug can be no greater than $7$ micrograms and no less than $3$ micrograms. You check the operation several times throughout the day to ensure that the manufacturing process is in control. Which of the following data sets would cause you to halt operations and look for a special cause?

$3\mathrm{.}5,3\mathrm{.}1,4\mathrm{.}9,4,4\mathrm{.}9,3,4,6,5$

$4\mathrm{.}5,5,4\mathrm{.}1,5,4,5,7,6\mathrm{.}2,3\mathrm{.}7,4$

$7,6\mathrm{.}4,5\mathrm{.}2,4,5,6,7,6,5,4$

$3,7,3,7,3,7,3,7,3,7$