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I need to solve a problem but i cant figure out how to do it in excel

**Tutor's Assistant:** The Advanced Math Tutor can help you get an A on your homework or ace your next test. Tell me more about what you need help with so we can help you best.

I need to solve the following problem in excel but cant figure out how to do it. Cars arrive at Carla’s Muffler Shop for repair work at an average of 3 per hour, following an exponential distribution.

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(a) What is the expected time between arrivals? (b) What is the variance of the time between arrivals? those are the questions that i need to answer in excel.

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