Question

- A recent survey of local cell phone retailers showed that of all cell phones sold last month, 75% had a camera, 50% had a music player and 30% had both.

- What is the probability that a cell phone sold last month had a camera or a music player? Show your work. (10pts)

- What is the probability that a cell phone sold last month did not have either a camera or a music player? Show your work. (10pts)

Answer #1

Union and intersection of events

A recent survey found that 72% of all adults over 50 own cell
phones. You randomly select 43 adults over 50, and ask if he or she
owns a cell phone. Find the mean number of cell phones owned by a
sample of 43 adults over 50 years old. Round to two decimal
places

Joseph is a sales person for a local cell phone retailer,
Aardvark Phones, Inc. Because the store is open six days a week,
including Saturdays, Joseph has to cover the sales desk on rotating
Saturdays each month. Three years into his employment, Joseph
converts to orthodox Judaism, and advises his employer that he can
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Aardvark proposes that he swap schedules with other sales people at
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A recent survey of a school showed that of all students
registered for a computer program in grade 11th, 54% of students
also registered for a math course, 38% also registered for a
physics course and 20% registered both. What is probability that
the grade 11th students also registered for math course or a
physics a) course? b) What is probability that the grade 11th
students did not also register either a math or a physics course?
Is a grade...

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...

A recent drug survey showed an increase in the use of drugs and
alcohol among local high school seniors as compared to the national
percent. Suppose that a survey of 100 local seniors and 100
national seniors is conducted to see if the proportion of drug and
alcohol use is higher locally than nationally. Locally, 69 seniors
reported using drugs or alcohol within the past month, while 60
national seniors reported using them. Conduct a hypothesis test at
the 5%...

A survey of U.S. adults found that 69% of those who text on cell
phones receive spam or unwanted messages. You randomly select 100
U.S. adults who text on cell phones and ask who receive spam or
unwanted messages. A) Write a complete sentence in the context of
the problem that describes what p represents in this problem. No
numbers. B) Are the criteria for using the normal distribution met?
EXPLAIN. Show any necessary calculations. C) If many samples of...

12. In a survey of 1364 people, 1001 people said they voted in a
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eligible voters actually did vote. Given that 71% of eligible
voters actually did vote, (a) find the probability that among 1364
randomly selected voters, at least 1001 actually did vote (b).
What do the results from part (a) suggest?
P(X≥1001)= ____
(Round to four decimal places as needed.)
13. In a study of 218,247 cell phone users,...

A poll of 2,061 randomly selected adults showed that 97% of them
own cell phones. The technology display below results from a test
of the claim that 94% of adults own cell phones. Use the normal
distribution as an approximation to the binomial distribution, and
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Show your work. ***Correct answers are in BOLD (how do we
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Test of p=0.94 vs p≠0.94
X= 1989, N= 2061, Sample...

The local automobile dealers released the results of a survey
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of these cars selected at random had neither an extended warranty
nor AWD? (10 points) What is the probability that a car had an AWD
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A recent drug survey showed an increase in the use of drugs and
alcohol among local high school seniors as compared to the national
percent. Suppose that a survey of 100 local seniors and 100
national seniors is conducted to see if the proportion of drug and
alcohol use is higher locally than nationally. Locally, 69 seniors
reported using drugs or alcohol within the past month, while 60
national seniors reported using them. Conduct a hypothesis test at
the 5%...

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