Probability: Exponential Distribution?

Posted on 2016-03-28 18:39:00 in Math by NASIR

On the average, 10 people per hour use an express teller machine situated inside a commercial complex. If a person just used an ATM machine, what is the probability that the next person will use the machine 

a. after 8 minutes? 
b. within 7 minutes? 
c. between 6 to 10 minutes? 


Please also show me your solutions. I really don't get this topic

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