A process that is considered to be in control measures an ingredient in ounces. Below are the last $10$ samples$($each of size n $=5)$ taken. The population process standard deviation is $1\mathrm{.}36.$

Samples Item $1$ Item $2$ Item $3$ Item $4$ Item $5$

$110911913$

$299121110$

$3121010118$

$499121010$

$5129101211$

$6101171310$

$79121188$

$813119108$

$999111310$

$1010119912$

$$a$)$ Standard deviation of the sampling means$=$

$$

enter your response here ounces $($round your response to three decimal$$ places