A restaurant employs 9 people. 2 bartenders, 3 waiters and 4 work in the kitchen. It has been observed that

on any day the probability of an employee to call in sick is 2% for the bartenders, 3% for the waiters and 1% for

the kitchen staff.

Calculate:

1 the probability of all bartenders coming to work on a random day.

2 the probability of no more than one employee missing from work on a random day.

3 the average number of the employees coming to work.

4 If on one day exactly one employee has called in sick, the probability he is from the kitchen staff.