Question Statement:
During thermal processing of a low-acid canned food, the cold-point temperature is monitored at 5-minute intervals during a holding period: at $t = 0\text{ min}$, $T = 115.1^\circ\text{C}$; at $t = 5\text{ min}$, $T = 121.1^\circ\text{C}$; and at $t = 10\text{ min}$, $T = 118.1^\circ\text{C}$. Taking $z = 10.0^\circ\text{C}$ and reference temperature $T_{ref} = 121.1^\circ\text{C}$, the lethal rates ($L = 10^{(T - 121.1)/10}$) are $0.251$ at $115.1^\circ\text{C}$, $1.000$ at $121.1^\circ\text{C}$, and $0.501$ at $118.1^\circ\text{C}$. Using the trapezoidal numerical integration rule ($F_0 = \frac{\Delta t}{2} [L_0 + 2 L_1 + L_2]$), the accumulated $F_0$ value in minutes over this 10-minute period is ________ (round off to 2 decimal places).