Customers send e-mails to a help desk of an online retailer every 5 minutes, on average, and the standard deviation of the interarrival time is 3 minutes. The online retailer has 6 employees answering e-mails. It takes on average 12 minutes to write a response e-mail. The standard deviation of the processing times is 5 minutes. (Do not round intermediate calculations. Round your answers to two decimal places.) (a) Estimate the average customer wait before being served.

How are sas and sss used to show that two triangles are congruent?

If the simple annual interest rate on a loan is 6, what is the interest rate in percentage per month?

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?