Question

According to an independent report, 85% of drivers wear sunglasses. If 15 drivers are selected, find the probability that exactly 9 of them wear sunglasses.

A recent survey found that 80% if internet searches are conducted using Google. If 10 searches are selected, what is the probability that at least 7 of them are conducted using Google?

Answer #1

**Solution:** According to an independent report,
85% of drivers wear sunglasses. If 15 drivers are selected, find
the probability that exactly 9 of them wear sunglasses.

**Answer:** The given process following the
binomial distribution with

Let x be the number of drivers who wear sunglasses

We have to find .

rounded to 4 decimal places

Therefore, the probability that exactly 9 of them wear sunglasses is

A recent survey found that 80% if internet searches are conducted using Google. If 10 searches are selected, what is the probability that at least 7 of them are conducted using Google?

**Answer:** The given process following the
binomial distribution with

Let x be the number of internet searches conducted using Google.

We have to find

.

rounded to 4 decimal places

Therefore the probability that at least 7 of them are conducted using Google is

Google it: According to a recent report, 68% of Internet
searches in a particular month used the Google search engine.
Assume that a sample of 22 searches is studied. Round the answers
to four decimal places.
(a) What is the probability that exactly 18 of them used
Google?
(b) What is the probability that 13 or fewer used Google?
(c) What is the probability that more than 18 of them used
Google?
(d) Would it be unusual if fewer than...

According to a recent report,
67%
of Internet searches in a particular month used the Google
search engine. Assume that a sample of
24
searches is studied. Round the answers to four decimal
places.
Part 1 of 4
(a) What is the probability that exactly
21
of them used Google?
Part 2 of 4
(b) What is the probability that
16
or fewer used Google?
Part 3 of 4
(c) What is the probability that more than
21
of them...

According to a survey conducted at the local DMV, 48% of drivers
who drive to work stated that they regularly exceed the posted
speed limit on their way to work. Suppose that this result is true
for the population of drivers who drive to work. A random sample of
12 drivers who drive to work is selected. Use the binomial
probabilities table (Table I of Appendix B) or technology to find
to 3 decimal places the probability that the number...

2.) When a car is randomly selected, the number of bumper
stickers and the corresponding probabilities are: 0 (0.814); 1
(0.083); 2 (0.044); 3 (0.019); 4 (0.012); 5 (0.008); 6 (0.008); 7
(0.004); 8 (0.004); 9 (0.004);
a.) Does the given information describe a probability distribution?
Explain why
b.) Assuming that a probability distribution is described, find
its mean and standard deviation.
c.) Use the range rule of thumb to identify the range values for
unusual numbers of bumper stickers....

According to the most recent census, 16.3% of US residents are
of Hispanic origin. One county supervisor believes her county has a
smaller percentage than what was reported in the census. A survey
of 220 individuals in the county was conducted, and each person was
asked to report their origin. It was found that 10.02% of those
surveyed identified as being of Hispanic origin. Test the
appropriate hypotheses using a significance level of 0.05.
H0:H0: Select an answer p̂ p ?...

7. If you flip 10 fair coins, what is the probability that: (a)
Exactly 5 of them are “heads”? (b) At
least 8 of them are “heads”?
8. Urn A has four red balls and two white balls, and urn B has
three red balls and four white
balls. A fair coin is tossed. If it lands heads up, a ball is
drawn from urn A; otherwise, a ball is
drawn from urn B. Compute (a) the probability a red...

6.) Assume that 15% of the people in your expedition trip own a
mobile phone, and you are randomly assigned to two partners in your
group. Find the probability that: a) The first partner will have a
mobile phone b) The first partner will not have a mobile phone c)
That both partners have a mobile phone d) That at most one will
have a mobile phone
7.) The following contingency table shows U.S. Adults, broken
down by political party...

Binomial probability:
1. Jasmine is taking a 20 question test for her driver's permit.
Each question has 4 choices and she guesses on each question (since
she never studied her manual!). What is the probability that she
gets exactly 16 questions correct?
2. Mr. Evans is a great EMT technician. He is able to save his
patients 98% of the time. If
he has 12 patients, what is the probability that exactly 2 are not
saved?
3. The baker is...

Please answer with method or formula used.
A) Puenaa is getting married tomorrow, at an outdoor ceremony in
the desert. In recent years, it has rained only 5 days each year.
Unfortunately, the weatherman has predicted rain for tomorrow. When
it actually rains, the weatherman correctly forecasts rain 90% of
the time. When it doesn't rain, he incorrectly forecasts rain 10%
of the time. What is the probability that it will rain on the day
of Puenaa's wedding?
B) A...

The table below shows a set of bivariate data: X and Y.
Calculate the covariance and correlation coefficients by
completing the below table, assuming sample data. Show all
workings. (Note: You can calculate the mean and standard deviation
of X & Y with Excel or your calculator; no working for their
calculation is required.)
X
Y
(X - X bar)
(Y - Y bar)
(X - X bar)(Y - Y bar)
5
5
-0.2
-0.6
0.12
2
3
-3.2
-2.6...

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