Question

According to a government study among adults in the 25- to
34-year age group, the mean amount spent per year on reading and
entertainment is $1928. Assume that the distribution of the amounts
spent follows the normal distribution with a standard deviation of
$434. Refer to the table in Appendix B.1. **(Round
z-score computation to 2 decimal places and the final
answer to 2 decimal places.)**

**a.** What percentage of the adults spend more
than $2140 per year on reading and entertainment?

Percentage ________ %

**b.** What percentage spend between $2140 and
$3000 per year on reading and entertainment?

Percentage _________ %

**c.** What percentage spend less than $1000 per
year on reading and entertainment?

Percentage ________ %

Answer #1

According to a government study among adults in the 25- to
34-year age group, the mean amount spent per year on reading and
entertainment is $1936. Assume that the distribution of the amounts
spent follows the normal distribution with a standard deviation of
$438. Refer to the table in Appendix B.1. (Round
z-score computation to 2 decimal places and the final
answer to 2 decimal places.)
a. What percentage of the adults spend more
than $2180 per year on reading...

According to a government study among adults in the 25- to
34-year age group, the mean amount spent per year on reading and
entertainment is $1,896. Assume that the distribution of the
amounts spent follows the normal distribution with a standard
deviation of $596. (Round your z-score computation
to 2 decimal places and final answers to 2 decimal
places.)
What percent of the adults spend more than $2,350 per year on
reading and entertainment?
What percent spend between $2,350 and...

The WAIS test is an IQ test for the population of young adults
(20—34 age group).
The WAIS test scores normally distributed with a mean of 110 and
a standard deviation of 25.
PLEASE SHOW YOUR WORK
What proportion of young adults has a WAIS score is
above 140.
What proportion of young adults has a WAIS score between
90 and 120.
Compute the interquartile range (IQR) of the WAIS
scores.
Find the 99-th percentile of the distribution of WAIS...

Best Electronics offers a “no hassle” returns policy. The number
of items returned per day follows the normal distribution. The mean
number of customer returns is 8.7 per day and the standard
deviation is 1.85 per day. Refer to the table in Appendix B.1. a.
In what percentage of the days 7 or fewer customers returning
items? (Round z-score computation to 2 decimal places and the final
answer to 2 decimal places.) Percentage % b. In what percentage of
the...

Best Electronics offers a “no hassle” returns policy. The number
of items returned per day follows the normal distribution. The mean
number of customer returns is 8.4 per day and the standard
deviation is 1.70 per day. Refer to the table in Appendix
B.1.
a. In what percentage of the days 7 or fewer
customers returning items? (Round z-score
computation to 2 decimal places and the final answer to 2 decimal
places.)
Percentage
%
b. In what percentage of...

According to a Pew Research Center study, in May 2011, 34% of
all American adults had a smart phone (one which the user can use
to read email and surf the Internet). A communications professor at
a university believes this percentage is higher among community
college students. She selects 339 community college students at
random and finds that 136 of them have a smart phone. In testing
the hypotheses: H 0 : p = 0.34 versus H a : p...

A Nielsen study indicates that 18- to 34-year olds spend a mean
of 93 minutes watching video on their smartphones per week. Source:
Data extracted from bit.ly/2rj8GHm. Assume that the amount of time
watching video on a smartphone per week is normally distributed and
that the standard deviation is 15 minutes. a. What is the
probability that an 18- to 34-year-old spends less than 77 minutes
watching video on his or her smartphone per week? b. What is the
probability...

A survey reported that the mean starting salary for college
graduates after a three-year program was $34,170.Assume that the
distribution of starting salaries follows the normal distribution
with a standard deviation of $3190. What percentage of the
graduates have starting salaries: (Round z-score
computation to 2 decimal places and the final answers to 4 decimal
places.)
a. Between $31,800 and $38,200?
Probability
b. More than $42,700?
Probability
c. Between $38,200 and $42,700?
Probability

A survey reported that the mean starting salary for college
graduates after a three-year program was $34,180.Assume that the
distribution of starting salaries follows the normal distribution
with a standard deviation of $3950. What percentage of the
graduates have starting salaries: (Round z-score
computation to 2 decimal places and the final answers to 4 decimal
places.)
a. Between $31,600 and $38,000?
Probability
b. More than $44,100?
Probability
c. Between $38,000 and $44,100?
Probability

According to a marketing website, adults in a certain country
average 54 minutes per day on mobile devices this year. Assume that
minutes per day on mobile devices follow the normal distribution
and has a standard deviation of 9 minutes. Complete parts a through
d below.
a. What is the probability that the amount of time spent today
on mobile devices by an adult is less than 63 minutes? nothing
(Round to four decimal places as needed.)
b. What is...

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