Question: If bolt thread length is normally distributed, what is the probability that the thread length of a randomly selected bolt is a. Within 1.5 SDs

If bolt thread length is normally distributed, what is the probability that the thread length of a randomly selected bolt is
a. Within 1.5 SDs of its mean value?
b. Farther than 2.5 SDs from its mean value?
c. Between 1 and 2 SDs from its mean value?

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