The service times for customers coming through a checkout counter in a retail store are independent random variables with mean 1.5 min

Question

The service times for customers coming through a checkout counter in a retail
store are independent random variables with mean 1.5 minutes and variance 1.0.
Approximate the probability that 100 customers can be served in less than 2
hours of total service time.

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Kiệt Gia 3 years 2021-08-05T18:43:53+00:00 1 Answers 117 views 0

Answers ( )

    0
    2021-08-05T18:45:20+00:00

    Answer:

    38.2  %

    Step-by-step explanation:

    120/100 = 1.2 (average time)

    (1.2 – 1.5)/1 = -.3

    z table value for “-.3” is .3821

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