Could somebody explain this task to me in detail and show all the steps?

A survey with 30 customers was done to see if they were satised with a service. a Age No Yes N/A below 30 7 4 11 30-65 5 6 11 above 65 2 6 8 Total 14 16 30 El a) What is the probability that the customer is satisfied? b) Given selected customer is satisfied, what is the probability that the customer is below 30. c) What is the probability that the customers i; below or equal to 65? d) Calculate the satisfaction rate for each age class separately and comment your result in 1-2 sentences