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9 December, 18:14

If the population mean payment time is 19.5 days, what is the probability of observing a sample mean payment time of 65 invoices less than or equal to 18.1077 days?

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  1. 9 December, 22:10
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    Answer: P (mean x<18.1077) = P (z< - 2.67) = 0.0038

    Step-by-step explanation:

    Value of Z for 18.1077 = (18.1077 - 19.5) / 0.5209 = - 2.67
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