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Julli [10]
3 years ago
15

Phoenix water is provided to approximately 1.43 million people, who are served through more than 362000 accounts. All accounts a

re metered and billed monthly. The probability that an account has an error in a month is 0.001, and accounts can be assumed to be independent.
Business
1 answer:
OlgaM077 [116]3 years ago
3 0

Answer:

The mean and standard deviation of the number of accounts error is:

  • mean = 362,000
  • standard deviation = 19

Explanation:

the parameters are:

  • n = number of accounts = 362,000
  • p = probability of error = 0.001

mean of the number of account errors = E(X) = np = (362,000 x 0.001) = 362

standard deviation = √[np(1 - p)] = √[362(1 - 0.001)] = √[362(0.999)] = √361.638 = 19.02 ≈ 19

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