9-65. According to an April 28, 2015, report on the website newsroom.aaa.com, the average cost of owning and

operating a sedan automobile in the United States in 2015 was $8,968. Suppose the California AAA plans to conduct a survey to determine whether the average cost of owning a sedan in California is less than the $8,968 for the nation as a whole. Assuming that the population standard deviation for the cost of owning a sedan is $750, what is the probability that the hypothesis test will lead to accepting the null hypothesis if the true mean cost in California is actually $8,700.

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