In a control chart, if the process mean is $20$ and the standard deviation of the sample means is $0\mathrm{.}5,$ what is the Upper Control Limit $($UCL$)$ for a $99...$

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In a control chart, if the process mean is $20$ and the standard deviation of the sample means is $0\mathrm{.}5,$ what is the Upper Control Limit $($UCL$)$ for a $99\mathrm{.}73\%$ confidence level $)=(3?$

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a $21\mathrm{.}5$

b $22\mathrm{.}5$

$23\mathrm{.}5$

d $20\mathrm{.}5$