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The property manager of a shopping mall claims that the mean score of their customer service is greater than 85. Twenty-ve customers were randomly selected

  1. The property manager of a shopping mall claims that the mean score of their customer service is greater than 85. Twenty-ve customers were randomly selected to evaluate the customer service of the mall. The average and standard deviation of the sample was found to be 87 and 7 respectively. Test the hypothesis at = 0.05.

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