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at call center, calls come in at an average rate of four calls per minute. Assume...

at call center, calls come in at an average rate of four calls per minute. Assume that the time elapsed from one call to the next has the exponential distribution, and that the times between calls are independent.

a. find the prob. that after a call is received, the next call occurs in less than 10 sec.

b. Find a 95% confidence interval for the number of calls in a minute.

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