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the accompanying table describes results of roadworthiness tests of cars that are 3 years old. the random variable x represents the numbers of cars that

the accompanying table describes results of roadworthiness tests of cars that are 3 years old. the random variable x represents the numbers of cars that failed among six that were tested for roadworthiness. find the mean and standard deviation for the number of cars that failed among the six cars that are testes

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