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Can I have an explanation for how to use z table to solve this problem ? Thanks Consider the e-billing case. The mean and the

Can I have an explanation for how to use z table to solve this problem ? Thanks

Consider the e-billing case. The mean and the standard deviation of the sample of n = 65 payment times are x = 18.4730 and s = 3.9045. Test Ho: / = 18.6 versus Ha: /

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