According to a medical study, it takes about 47.5 hrs, on average, for Roseola virus to fade away in infected patients (children). Assuming that the fading times of Roseola virus in infected patients are normally distributed with standard deviation 0.35, what's the probability of having a random case where the fading time of the virus in an infected patient is less than 47.85 hours? Find the answer without using the normalcdf(...) function. (Write the answer in decimals)

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