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In the case of Caseneda v. Partida, it was found that during a period of 11years in Hidalgo Country, Texas, 870 people were selected for grand jury duty and 39% of them were Mexican-American. Among the people eligible for grand jury duty, 79.1% were Mexican-American. Use 0.01 significance level to test the claim that the selection process is biased against Mexican-Americans. What is the mean and standard deviation for the numbers of Mexican Americans?

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