On an average, there are 2 visits to a supershop

On an average, there are 2 visits to a supershop per minute. What is the probability that the supershop will have 100 customer visits within the next 1 hour?

i) A mobile operator company has to deal with 12 site down issues per hour. What is the probability that it will have to solve at least 4 site down issues within the next 10 minutes?

ii) In a customer service center, there are 18 complaints dropped per minute. What is the probability that the number of complaints in the next minute will be not more than 4 and not less than 2?