Formulate the appropriate null and alternative hypotheses in (a) words and (b) symbols in the following scenario. 1. A psychologist believes that it will take at least an hour for certain disturbed children to learn a task. 2. According to the norms established for a history test, grade 8 students should have an average of 81.7 with a standard deviation of 8.5.

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Q: The joint pmf of X and Y are given in the table below: Y X 4 2 1 15 15 2 15 3 3 15 15 上面00

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