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(f) P(-0.09 % Z (f) < 231) 7 _ The blcxul nicotine level of a smoker may 1K: by a normal distribution with mean 31

(f) P(-0.09 % Z

(f) < 231) 7 _ The blcxul nicotine level of a smoker may 1K: by a normal distribution with mean 31 Ong/m/, and standard deviation 110 ng/rnL. Calculate the probability that a smoker at random: (a) a nicotine level lower than 321 ng/mL? 12 mksl 13 mksl

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