Question

Forty percent of people traveling on business carry a cell
phone or laptop. In a sample of 15 people,

a. What is the probability that three will have a cell phone
or a laptop?

b. What is the probability that 12 of the travelers do not
have a cell phone or laptop?

c. What is the probability that at least three have
both?

Answer #1

It is reported that 30 percent of American households use a cell
phone exclusively for their telephone service. In a sample of nine
households, find the probability that:
(a) None use a cell phone as their exclusive service. (Round
your answer to 4 decimal places.) Probability
(b) At least one uses the cell exclusively. (Round your answer
to 4 decimal places.) Probability
(c) At least six use the cell phone. (Round your answer to 4
decimal places.) Probability

Consider the following information about travelers on vacation: 40%
check work email, 30% use a cell phone to stay connected to work,
35% bring a laptop with them, 19% both check work email and use a
cell phone to stay connected, and 54.4% neither check work email
nor use a cell phone to stay connected nor bring a laptop. In
addition, 84 out of every 100 who bring a laptop also check work
email, and 70 out of every 100...

A national survey found that 56% of adults ages 25-29 had only
a cell phone and no landline. Suppose that three 25-29-year-olds
are randomly selected. Complete parts a through c below.
a) What is the probability that all of these adults have only a
cell phone and no landline? (Round to four decimal places as
needed.)
b) What is the probability that none of these adults have only a
cell phone and no landline? (Round to four decimal places as...

In the U.S. 14% of people
use their cell phones to access the internet. You select a random sample of 10 people.
a. Determine the probability that
exactly two use their cell phones to access the
internet.
b. Determine the probability that
at most two use their cell phones to access the
internet.
c. Determine the probability that
two or more use their cell phones to access the
internet.
d. Determine the probability at
least one uses their cell phone...

9. In a large city, 82% of residents own a cell phone. Suppose
that we randomly select three city residents. What is the
probability that at least one of the three residents does not own a
cell phone? [The city is large enough so that we can assume
independence].
A. 0.994
B. 0.449
C. 0.006

Problem 4) In 2012, the percent of American adults who owned
cell phones and used their cell phone to send or receive text
messages was at an all-time high of 80%. Assume that 80% refers to
the population parameter π. More recently in 2016, a polling firm
contacts a simple random sample of 110 people chosen from the
population of cell phone owners. The firm asks each person “do you
use your cell phone to send or receive texts? Yes...

Cell Phone Fight You are arguing over a cell phone while
trailing an unmarked police car by 30 m. Both your car and the
police car are traveling at 105 km/h. Your argument diverts your
attention from the police car for 2.0 s (long enough for you to
look at the phone and yell, "I won't do that!"). At the beginning
of that 2.0 s, the police officer begins emergency braking at 5
m/s2. (a) What is the separation between...

In a study of 412 comma 126 cell phone users, it was found that
162 developed cancer of the brain or nervous system. Assuming that
cell phones have no effect, there is a 0.000474 probability of a
person developing cancer of the brain or nervous system. We
therefore expect about 196 cases of such cancer in a group of 412
comma 126 people. Estimate the probability of 162 or fewer cases of
such cancer in a group of 412 comma...

2. In a study of 437 comma 485 cell phone users, it was found
that 54 developed cancer of the brain or nervous system. Assuming
that cell phones have no effect, there is a 0.000168 probability
of a person developing cancer of the brain or nervous system. We
therefore expect about 74 cases of such cancer in a group of 437
comma 485 people. Estimate the probability of 54 or fewer cases of
such cancer in a group of 437...

In a study of 452,318 cell phone users, it was found that 71
developed cancer of the brain or nervous system. Assuming that cell
phones have no effect, there is a 0.000208 probability of a person
developing cancer of the brain or nervous system. We therefore
expect about 95 cases of such cancer in a group of 452,318 people.
Estimate the probability of 71 or fewer cases of such cancer in a
group of 452,318 people. What do these results...

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