Answer to Question #19804 in Quantitative Methods for shirley

Question

a tipical workshop has 10 attendees. in 35% of the workshop nobody signed up in the advance class. in 30% of the workshop one signed up. in 25% of the workshop two signed up. in 10% of the workshop three or more signed up. the adviser is holding a workshope tommorro.
what is the probability that
at least tow peple will sign up for the advance class.
no more than one person will sign up