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​The amount of cosmic radiation to which a person is exposed

5. The amount of cosmic radiation to which a person is exposed while flying by jet across the United States is a random varia


The amount of cosmic radiation to which a person is exposed while flying by jet across the United States is a random variable having a normal (Gaussian) distribution with average u = 4.35 mrem and o = 0.59 mrem of radiation. Find the probabilities that a person on such a flight will be exposed to 

a. more than 5 mrem of cosmic radiation 

b. between 3 and 4 mrem of cosmic radiation

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