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

Solution: Step 1: It is given that the bolt thread length is normally distributed, we have to find the probability that the thread length of normally selected bolt is Within 1.5SDs of its mean value Farther than 2.5SDs from its mean value. Between 1 and 2 SDs from its mean value.