Question: '. Suppose that X is a normally distributed random variable with a mean of {l and a variance of 1. [a] Find the pi'ebabilit},r that

'. Suppose that X is a normally distributed random variable with a mean of {l and a variance of 1. [a] Find the pi'ebabilit},r that X + 4 is less than 4. (1')] Find the value of b an that the probability of X I:- being less than zero is 0.975

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