PIN pad shipments. Personal identification number (PIN) pads are devices that connect to point-of-sale electronic cash registers for debit and credit card purchases. Refer to The Nilson Report (Oct. 2008) listing of the volume of PIN pad shipments by manufacturers worldwide, Exercise 2.5 (p. 39). Recall that for the 12 manufacturers listed in the table, a total of 334,039 PIN pads were shipped in 2007. (The data are saved in the PINPADS file.) Suppose you randomly select one of these PIN pads and identify the manufacturer.
Manufacturer
Number Shipped (units)
Bitel
13,500
CyberNet
16,200
Fujian Landi
119,000
Glintt (ParaRede)
5,990
Intelligent
4,562
KwangWoo
42,000
Omron
20,000
Pax Tech.
10,072
ProvencoCadmus
20,000
SZZT Electronics
67,300
Toshiba TEC
12,415
Urmet
3,000
Source: The Nilson Report, No. 912, October 2008 (p. 9).
a. List the sample points for this experiment.
b. Explain why the probability of each sample point is not 1/12, then calculate the probability of each sample point.
c. Find the probability that the PIN pad is shipped by either Fujian Landi or SZZT Electronics.