Fill in the blank. Suppose the round-trip airfare between Philadelphia and Los Angeles a month before the departure date follows the standard normal probability distribution with a mean of $387.20 and standard deviation of $68.50. The interval around the mean that contains 95% of the airfares is O A. ($318.70, $455.70) O B. ($352.95, $421.45) OC. ($284.45, $489.95) O D. ($250.20, $524.20)

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