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If bolt thread length is normally distributed, what is the probability that the thread length of...

If bolt thread length is normally distributed, what is the probability that the thread length of a randomly selected bolt is

(a) Within 0.6 SDs of its mean value?


(b) Farther than 1.2 SDs from its mean value?


(c) Between 1 and 2 SDs from its mean value?

math   Statistics-And-Probability   
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