4. Using the average of the values of R3/τ2 that you filled in just for planets c, f, and d in #2 (which are the most accurate), approximately what is the mass of 55 Cancri in kg? Show your reasoning.
5. Approximately what is the mass of 55 Cancri in solar masses (MS)? (E.g. if it is half a solar mass, the answer would be 0.5) Show your reasoning.
Is the mass calculated within 10% of 1.03 Ms? If no, why not?