4.The percentage of left-handed individuals stands at roughly 10 percent. Four adults are selected at random to take a pencil and paper questionnaire in a room where there are 5 desks, 4 with the writing pad designed for righties and 1 specially made for lefties.

a.What is the probability that the left-handed desk is not needed?

b.What is the probability that there are not enough left-handed desks?

c.How many lefties are expected