The temperature at the slowest heating location $($coldest point$)$ for a food in a can is as shown. Estimate the reference thermal death time $($F$0)$ for the thermal process. If the D value of a microorganism at $121\backslash$deg C is $0\mathrm{.}8$ min and the initial microbial populations is $104$ cells per container. Estimate the spoilage probability of the thermal process $($compute $"$r$").$

Time $($min$)$ Temperature $($C$)$

$065$

$195$

$2115$

$3130$

$4125$

$5110$

$690$