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Exercise 4: After weighing 12 grapefruits, we found that the mathematical expectation u of the weight X M of a grapefruit, belongs to the 95%

Exercise 4: After weighing 12 grapefruits, we found that the mathematical expectation u of the weight X M of a grapefruit, belongs to the 95% confidence interval: [390g; 520g). a) Give the sample mean (X) b) Give the sample standard deviation

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