A) A student believes that the average grade on the final examination in statistics is at least 85. She plans on taking a sample to test her belief. Develop the null and alternative hypotheses to test the validity of this belief. B)The average life expectancy of tires produced by the Whitney Tire Company has been 40,000 miles. Management believes that due to a new production process, the life expectancy of its tires has increased. Develop the null and alternative hypotheses to test the validity of this belief.

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