Question: Given a normally distributed variable with mean 80 and variance of 4, supposed we sample a single observation from this variable, what is the probability

Given a normally distributed variable with mean 80 and variance of 4, supposed we sample a single observation from this variable, what is the probability that:

it is less than 80

between 79 and 83

greater than 84

less than 81

between 80 and 85

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