There are four stores in an area, with characteristics as follows: Travel time (average) Store R S T U 32 minutes 18 minutes 27 minutes 23 minutes Size (sq. ft.) 8000 1800 4400 1000 If lambda (A) is assumed to be 3, what are: a) the attractions for the four stores? b) the probabilities that a customer in the area will visit each of the four stores?