Sample Problems for Chapter 4
3, p 190
How many permutations of three items can be selected from a group of six? Use the letters A,
B, C, D, E, and F to identify the items, and list each of the permutations of items B, D, and F.
= = 120
BDF
BFD
DBF
DFB
FB
Sample Problems for Chapter 6
3, p. 285
Delta Airlines quotes a flight time of 2 hours, 5 minutes for its flights from Cincinnati to Tampa.
Suppose we believe that actual flight times are uniformly distributed between 2 hours and 2 hours, 20
minutes.
a. S
49, p. 268
Airline passengers arrive randomly and independently at the passenger-screening facility at a major
international airport. The mean arrival rate is 10 passengers per minute.
a. Compute the probability of no arrivals in a one-minute period.
p(x
7, p. 234
The probability distribution for the random variable x follows.
x
f(x)
20
25
30
35
.20
.15
.25
.40
a. Is this probability distribution valid? Explain.
Yes. The probabilities are all between 0 and 1.0 and they add to 1.0
b. What is the probabilit