What is the smallest sample size that guarantees that the margin of error is less than 15 when constructing a 95% confidence interval for a population mean with the assumed population standard deviation of 509.72? (Round UP to the nearest integer)

After working together for three hours on a common task to workers have completed fractional parts of the job equal to T /4 and T /6. What fractional part of the task has been completed

At the stadium, there are three lines for arriving customers, each staffed by a single worker. The arrival rate for customers is 140 per minute and each customer takes (on average) 1.1 seconds for a worker to process. The coefficient of variation for arrival time is 1.4 and the coefficient of variation for service time is 1. (Round your answerto three decimal places.) How much time (in seconds will an average customer spend in queue? seconds

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