Question

In a sample of 100 students taken randomly from QU, 70 of them have Twitter account, 80 have Facebook account, and 60 of them have both accounts. If a student is randomly selected:

The probability that he/she has at least one account is

The probability that he/she has no Twitter account is

The probability that he/she has Twitter account only is

The probability that he/she has neither Twitter nor Facebook
account is

The probability that he/she has either Twitter or Facebook account
but not both is

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About 60% of the car accidents in a given highway road are due to exceed of the limited high speed. If a study will investigate 10 cars accidents

The probability that none is due to exceed of the limited high
speed is

The probability that 5 exact accidents are due to exceed of the
limited high speed is

The probability that at least 1 car accident is due to exceed of
the limited high speed is

The probability that at most 1 car accident is due to exceed of the
limited high speed is

The expected number of car accidents due to exceed of the limited
high speed is

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A sales firm receives on average three calls per hour on its toll-free number. For any given hour, find the probability that it will receive the following:

at most 3 calls.

at least 3 calls.

five or more calls.

between 1 and 4 calls in 2 hours.

Find the average number of calls.

Find the standard deviation of number of calls.

--

We select randomly one number from the set S={-2, 0, 1, 3}. Let X be the obtained number. The variance of the random variable X is

--

The table shows the results of a survey of students in two STAT 101 classes

Do you Have class at 8am? Did you watch more than
one hour of TV last night?

Yes No

Yes 11 6

No 13 10

What is the probability that a student watch more than one hour TV
or has no 8am class?

Answer #1

Case 5.1
EuroWatch Company assembles expensive wristwatches and then
sells them to retailers throughout Europe. The watches are
assembled at a plant with two assembly lines. These lines are
intended to be identical, but line 1 uses somewhat older equipment
than line 2 and is typically less reliable. Historical data have
shown that each watch coming off line 1, independently of the
others, is free of defects with probability 0.98. The similar
probability for line 2 is 0.99. Each line...

10. Scott takes $10,000 from his
bank account to set up a small donut-shop business. He meets with
an attorney, and finds out he can set up a sole proprietorship for
under $100, but a corporation would cost over $500 ($175 to the
state, about $400 to the attorney). He decides on a sole
proprietorship. He signs a one-year lease, and starts his business.
After six months of operations, he closes the business because of
much-lower-than-expected sales. After using the...

C ASE PRO B L E M 2: M c NEIL’S A UTO M ALL
Harriet McNeil, proprietor of McNeil’s Auto Mall, believes that it
is good business for her atuomobile dealership to have more
customers on the lot than can be served, as she believes this
creates an impression that demand for the automobiles on her lot is
high.
Copyright 2020 Cengage Learning. All Rights Reserved. May not be
copied, scanned, or duplicated, in whole or in part. Due...

Assignment 2
1. Assume that you have two biased coins and one fair coin. One
of the biased coins are two tailed and the second biased one comes
tails 25 percent of the time. A coin is selected randomly and
flipped. What is the probability that the flipped coin will come up
tail?
2. One white ball, one black ball, and two yellow balls are
placed in a bucket. Two balls are drawn simultaneously from the
bucket. You are given...

#46 In a survey of 2000 adults 50 years and older of whom 20%
were retired and 80% were pre-retired, the following question was
asked: Do you expect your income needs to vary from year to year in
retirement? Of those who were retired, 23% answered no, and 77%
answered yes. Of those who were pre-retired, 28% answered no, and
72% answered yes. If a respondent in the survey was selected at
random and had answered yes to the question,...

1. Is NASCARs main goal to maximize profits? If not, what is
their major goal? Is there a tradeoff involved here?
2. Is the motivation for the actions described in the NYT
article (safety changes, blackbox data collection) connected to
their goal? Explain.
3. If people tune in to see crashes (Nascar fans love crashes
the way hockey fans love fights; when you watch the Speed Channel's
edited replays of Nascar races, the plot is always the same: green
flag,...

1. Tendons and ligaments are similar because they both have:
a limited blood supply and low metabolism
an abundant blood supply and low metabolism
a limited blood supply and high metabolism
an abundant blood supply and high metabolism
2. What is the name of the outer layer of connective tissue on
skeletal muscle?
perimysium
epimysium
endomysium
intermediate fascia
3. The functional units of skeletal muscle that allow it shorten
are:
tendons
fascicles
sarcomeres
perimysium
4. In terms of muscle actions...

Company Case Allstate: Bringing Mayhem to the Auto Insurance
Advertising Wars
In the spring of 1950, the teenage daughter of Allstate
general sales manager Davis Ellis was stricken with hepatitis
shortly be- fore she was to graduate from high school. The worried
executive arrived home from work one evening just as his wife
returned from the hospital where their daughter was admitted. As he
met her at the front door, his wife reported, “The hospital said
not to worry. ....

In the case below please answer the following 4- 6 pages
1. State the ethical issues
2. State the legal issues
3. Discuss the options/debate the issues
4. Discuss extra info needed to make decision
Rina Cummings has worked three 12-hour shifts
every week at Amazon’s gargantuan New York City warehouse, called
JFK8, on Staten Island since it first began operations in late
2018. As a sorter on the outbound ship dock, her job is to inspect
and scan a...

Ben and Chris combined their love of hockey with a business
venture. They purchased a small portable cart and began selling
hockey memorabilia outside of the hometown hockey arena. Their
first year went well, but this past year has been a real struggle.
Due to poor economic conditions including a loss of jobs, ticket
sales at the arena are down, which has significantly hurt their
sales as well. As a recent business school graduate, you explain to
Ben and Chris:...

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