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DanielleElmas [232]
4 years ago
11

Your office network has been measured to stay working an average of 2,200 hours with a standard deviation of 285 hours.

Business
1 answer:
navik [9.2K]4 years ago
6 0

Answer:

1.74%

Explanation:

Mean number of hours (μ) = 2,220 hours

Standard deviation (σ) = 285 hours

Assuming a normal distribution, the z-score for any number of hours a network stays up, X, is given by:

z = \frac{X-\mu}{\sigma}

For X = 2,800 hours, the z-score is:

z=\frac{2,800-2,200}{285}\\z=2.11

A z-score of 2.11 corresponds to the 98.26th percentile of a normal distribution. The probability that the network will stay up for 2,800 hours before it fails is:

P(X>2,800) = 100\%-98.26\% = 1.74\%

The probability is 1.74%.

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