Cell phone handoff behavior. Refer to the Journal of Engineering, Computing and Architecture (Vol. 3., 2009)

study of cell phone handoff behavior, Exercise 3.62

(p. 171).

Recall that a “handoff” describes the process of a cell phone moving from one base channel (identified by a color code)

to another. During a particular driving trip a cell phone changed channels (color codes) 85 times. Color code “b”

was accessed 40 times on the trip. You randomly select 7 of the 85 handoffs. How likely is it that the cell phone accesses color code “b” only twice for these 7 handoffs?