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describe probability using normal distribution.

If the expanse of cosmic radiation to which a person is exposed while flying by jet across the US is a random variable having the normal distribution with µ=5.35 mrem and σ = 0.59 mrem. What is the probability that the amount of cosmic radiation to which a person will be exposed on such a flight is

1) Between 3.50 and 6.5 mrem

2) At most 7.5 mrem

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