Question

You may need to use the appropriate appendix table to answer this question. Automobile repair costs continue to rise with the average cost now at $367 per repair.† Assume that the cost for an automobile repair is normally distributed with a standard deviation of $88. Answer the following questions about the cost of automobile repairs.

(a) What is the probability that the cost will be more than $470? (Round your answer to four decimal places.)

(b) What is the probability that the cost will be less than $290? (Round your answer to four decimal places.)

(c) What is the probability that the cost will be between $290 and $470? (Round your answer to four decimal places.)

(d) If the cost for your car repair is in the lower 5% of automobile repair charges, what is your maximum possible cost in dollars? (Round your answer to the nearest cent.) $

Answer #1

You may need to use the appropriate appendix table or technology
to answer this question.
Although studies continue to show smoking leads to significant
health problems, 20% of adults in a country smoke. Consider a group
of 450 adults.
(b)What is the probability that fewer than 80 smoke? Use the
normal approximation of the binomial distribution to answer this
question. (Round your answer to four decimal places.)
(c)What is the probability that from 95 to 100 smoke? Use the
normal...

You may need to use the appropriate appendix table to answer
this question.
Suppose that the mean daily viewing time of television is 8.35
hours. Use a normal probability distribution with a standard
deviation of 2.5 hours to answer the following questions about
daily television viewing per household
(a)
What is the probability that a household views television
between 5 and 12 hours a day? (Round your answer to four decimal
places.)
(b)
How many hours of television viewing must...

You may need to use the appropriate appendix table to answer
this question.
The time needed to complete a final examination in a particular
college course is normally distributed with a mean of 80 minutes
and a standard deviation of 10 minutes. Answer the following
questions.
(a)What is the probability of completing the exam in one hour or
less? (Round your answer to four decimal places.)
(b)What is the probability that a student will complete the exam
in more than...

You may need to use the appropriate appendix table or technology
to answer this question.
A center for medical services reported that there were 295,000
appeals for hospitalization and other services. For this group, 40%
of first-round appeals were successful. Suppose 10 first-round
appeals have just been received by a Medicare appeals office.
(Round your answers to four decimal places.)
(a)
Compute the probability that none of the appeals will be
successful.
(b)
Compute the probability that exactly one of...

You may need to use the appropriate appendix table or technology
to answer this question. A center for medical services reported
that there were 295,000 appeals for hospitalization and other
services. For this group, 55% of first-round appeals were
successful. Suppose 10 first-round appeals have just been received
by a Medicare appeals office. (Round your answers to four decimal
places.) (a) Compute the probability that none of the appeals will
be successful. (b) Compute the probability that exactly one of...

You may need to use the appropriate appendix table to answer
this question. Alexa is the popular virtual assistant developed by
Amazon. Alexa interacts with users using artificial intelligence
and voice recognition. It can be used to perform daily tasks such
as making to-do lists, reporting the news and weather, and
interacting with other smart devices in the home. In 2018, the
Amazon Alexa app was downloaded some 2,800 times per day from the
Google Play store.† Assume that the...

You may need to use the appropriate appendix table or technology
to answer this question. A population has a mean of 200 and a
standard deviation of 50. Suppose a sample of size 100 is selected
and x is used to estimate μ. (Round your answers to four decimal
places.)
(a) What is the probability that the sample mean will be within
±5 of the population mean?
(b) What is the probability that the sample mean will be within
±10...

ou may need to use the appropriate appendix table or technology
to answer this question.
The port of South Louisiana, located along 54 miles of the
Mississippi River between New Orleans and Baton Rouge, is the
largest bulk cargo port in the world. The U.S. Army Corps of
Engineers reports that the port handles a mean of 4.5 million tons
of cargo per week.† Assume that the number of tons of cargo handled
per week is normally distributed with a...

You may need to use the appropriate appendix table or technology
to answer this question.
Consider the following hypothesis test.
H0: μ ≥ 10
Ha: μ < 10
The sample size is 130 and the population standard deviation is
assumed known with σ = 5.Use α = 0.05.
(a) If the population mean is 9, what is the probability that
the sample mean leads to the conclusion do not reject
H0? (Round your answer to four decimal
places.)
(b) What...

You may need to use the appropriate appendix table or technology
to answer this question.
A newspaper reports that the average expenditure on Valentine's
Day is $100.89. Do male and female consumers differ in the amounts
they spend? The average expenditure in a sample survey of 40 male
consumers was $138.67, and the average expenditure in a sample
survey of 30 female consumers was $61.64. Based on past surveys,
the standard deviation for male consumers is assumed to be $35,...

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