(b) The number of customers who patronise a coffee shop follows a Poisson distribution with a mean of 20 per hour. Find the probability that: i. No customer patronises the coffee shop in a time...

Extracted text: (b) The number of customers who patronise a coffee shop follows a Poisson distribution with a mean of 20 per hour. Find the probability that: i. No customer patronises the coffee shop in a time interval of 6 minutes. ii. At least one customer patronises the coffee shop in a time interval of 12 minutes.