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2) The average and standard deviation of thickness of a steel plate om 25 samples are measured as 33 mm and 3 mm, respectively. If

2) The average and standard deviation of thickness of a steel plate om 25 samples are measured as 33 mm and 3 mm, respectively. If the actual mean thickness is 30 mm, determine the probability of getting a sample mean result as high or higher than 33 mm. What does this answer imply? Write necessary assumption(s). (7 marks)

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