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In the tests made on N= 40 steel rods, the mean and standart deviation of the failure load have been found as x=3.a t and

In the tests made on N= 40 steel rods, the mean and standart deviation of the failure load have been found as x=3.a t and sx=0.3 t, respectively. Which value will not the mean failure load be less than at a confidence level of % 90?

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