Suppose That the 1999 Monthly Cost for Health Care for an Employee

Suppose that the 1999 monthly cost for health care for an employee and two dependents is given in the following table.
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$\begin{array}{lr}{\text { Provider }} & {\text { Cost }} \\\text { Maxicare } & \$ 423.03 \\\text { Cigna } & \$ 426.35 \\\text { Health Net } & \$ 431.07 \\\text { Pacific Care } & \$ 440.83 \\\text { Health Plan of the Redwoods } \$ 449.82 \\\text { Kaiser } & \$ 454.19 \\\text { Aetna U.S. Healthcare } & \$ 458.25 \\\text { Blue Shield HMO } & \$ 462.27 \\\text { Omni Healthcare } & \$ 469.21 \\\text { Lifeguard } & \$ 473.33\end{array}$
Round your answer to the nearest cent. What is the mean? $ __________