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final answer please Suppose the stiffness of a certain type of steel beam used in building of construction has mean 30 kN/mm and standard deviation

final answer please

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Suppose the stiffness of a certain type of steel beam used in building of construction has mean 30 kN/mm and standard deviation 4 kN/mm. If a random sample of 36 beams is selected, what is the probability that the sample mean stiffness of the beams is less than 31 kN/mm? (inclusive) [answer should be in decimal form, rounded to 4 decimal places]

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