QUESTION 6 po A city employee services 12 ice-making machines at skating rinks a

Question

QUESTION 6 po A city employee services 12 ice-making machines at skating rinks around the city, as they require it Ice-making machines run 24 hours per day, and each requires service on average every 300 hours Service takes an average of 6 bours. What is the probablity that twe or more ice-making machines are out of service at the same lime? (Choose closest answer.) ( 10% UEST?ON 7 A conference is being held at a centre that has two different entrances A repistration deak it being set op at each entrance. Assume that each desk will as m queue and will see ans equal portion of the expected 125 total customens per bour aming at the conference (assume Poissonaials and that customers naill not line pockey between regustration desdku since they bre sienificaot dintances spart. If each registration desk can serre one eustomer at a time, and tdhe average tume to serve a customer i 075 minutes then what will be the average time that a customer waits in a line in minutes) before being able to register? a 4 16 mins b 2.67 mins c1 34 mins d 117 mins 084 mins

Explanation / Answer

Question 7:

Arrival rate :125 customer per hour.

Service rate=2 (60/.75)= 160 customer per hour

Average waiting time will be:

125/(80(160-125))=0.44643 hours or 2.67 mins

So answer is B. 2.67 mins

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