At Lido and Frank Mini Food, customers spend an average of 25 minutes selecting their groceries. The check out time follows a normal distribution with a mean service time of 3 minutes and a standard deviation of 1 minute. Customers arrived at the cashier counter according to a Poisson distribution at the average rate of 8 customers per hour. What is the average time (in minute) a customer would spend in the store?
a. 24
b. 25.55
c. 26.11
d. 29.11
e. None of the above