Question: - A manager is thinking about introducing a new billing system. She figures out that the new system will be beneficially introduced if the average

- A manager is thinking about introducing a new billing system.

- A manager is thinking about introducing a new billing system. She figures out that the new system will be beneficially introduced if the average monthly account is more than $170. A random sample of 400 monthly accounts is drawn, and the mean is $178. Assume the accounts are approximately normally distributed with 8D $65.9Can you conclude that the new system will be cost-effective

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