Suppose that long term access rates for four files $($F$0...$F$3)$ are: H$0=0\mathrm{.}1,$ H$1=0\mathrm{.}38,$ H$2=0\mathrm{.}364,$ H$3=0\mathrm{.}156.$ The file$-$use in number of accesses is given by N$0=13,$ N$1=21,$N$2=36,$N$3=51.$Access rate of Fi is defined as Ni$/($Total accesses$).$ What is the statistic$$value that is used to indicate normal or abnormal behavior?$[$the mean, one statistic used.$]---$ Write answer using $3$ decimal places. Example: If answer is $2\mathrm{.}34256$ write $2\mathrm{.}343$