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Question 24.14: Tension test is carried out on 120 specimens made of grey ca...

Tension test is carried out on 120 specimens made of grey cast iron of grade FG300. It is observed that the ultimate tensile strength (UTS) is normally distributed with a mean of 300 N/mm² and a standard deviation of 25 N/mm².
(i) How many specimens have UTS less than 275 N/mm²?
(ii) How many specimens have UTS between 275 and 350 N/mm²?

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