A) No rivet is weaker than 475 N and stronger than 525 N
B) The standard deviation of strength of random sample of rivets is 25 N
C) There is an equal probability of failure strength to be either 475 N or 525 N
D) There is approximately two-to-one chance that the strength of a rivet lies between 475 N or 525 N.
Correct Answer: A
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