An automobile dealer has kept records on the customers who ...

[AEWBW]

An automobile dealer has kept records on the customers who visited his showroom. Forty percent of the people who visited his dealership were female. Furthermore, his records show that 35 of the females who visited his dealership purchased an automobile, while 20 of the males who visited his dealership purchased an automobile. Let A1 = the event that the customer is female A2 = the event that the customer is male
 a. What is the probability that a customer entering the showroom will buy an automobile?
  b. A car salesperson has just informed us that he sold a car to a customer. What is the probability that the customer was female?

Question 2

In data envelopment analysis, the percentage of an individual operating unit's resources that are available to the composite operating unit is the
 a. efficiency index.
  b. local optimum.
  c. global optimum.
  d. equilibrium point.

[karlss]

Answer to Question 1

a. 0.26
b. 0.538

Answer to Question 2

a