I need to work out the probability that someone will be able to complete a minimum of 10 hours of rehearsals in one week. The probability that this person is free each day is 60% on a weekday and 30% on the weekend. There are 3 hours of rehearsal time available every day except Tuesday and Wednesday when there are 4.

If available on a given day then they can use all the time available to them.

How would I go about working this out?

Thanks!