A study indicates that 18- to 24- year olds spend a mean of 145 minutes watching...
A study indicates that 18- to 24- year olds spend a mean of
145
minutes watching video on their smartphones per month. Assume that the amount of time watching video on a smartphone per month is normally distributed and that the standard deviation is
15
minutes. Complete parts (a) through (d) below.
a.
What is the probability that an 18- to 24-year-old spends less than
120
minutes watching video on his or her smartphone per month?
The probability that an 18- to 24-year-old spends less than
120
minutes watching video on his or her smartphone per month is
. 0475
.
(Round to four decimal places as needed.)
b.
What is the probability that an 18- to 24-year-old spends between
120
and
165
minutes watching video on his or her smartphone per month?
The probability that an 18- to 24-year-old spends between
120
and
165
minutes watching video on his or her smartphone per month is
. 8607
.
(Round to four decimal places as needed.)
c.
What is the probability that an 18- to 24-year-old spends more than
165
minutes watching video on his or her smartphone per month?
The probability that an 18- to 24-year-old spends more than
165
minutes watching video on his or her smartphone per month is
. 0918
.
(Round to four decimal places as needed.)
d.
One
percent of all 18- to 24-year-olds will spend less than how many minutes watching video on his or her smartphone per month?
One
percent of all 18- to 24-year-olds will spend less than
________
minutes watching video on his or her smartphone per month.
(Round to two decimal places as needed.)
Homework Answers
Add Answer to:
A study indicates that 18- to 24- year olds spend a mean
of
145
minutes watching...
A study indicates that 18- to 24- year olds spend a mean of 145 minutes watching...
A study indicates that 18- to 24- year olds spend a mean of 145 minutes watching video on their smartphones per month. Assume that the amount of time watching video on a smartphone per month is normally distributed and that the standard deviation is 15 minutes. Complete parts (a) through (d) below. a. What is the probability that an 18- to 24-year-old spends less than 120 minutes watching video on his or her smartphone per month? The probability that an...
A Nielsen study indicates that mobile subscribers between 18 and 24 years of age spend a...
A Nielsen study indicates that mobile subscribers between 18 and 24 years of age spend a substantial amount of time watching video on their devices, reporting a mean of 396 minutes per month. Assume that the amount of time watching video on a mobile device per month is normally distributed and that the standard deviation is 50 minutes What is the probability than and 18-24 year old mobile subscriber spends less than 321 minutes watching a video on his or...
On the planet of Mercury, 4-year-olds average 3.2 hours a day unsupervised. Most of the unsupervised...
On the planet of Mercury, 4-year-olds average 3.2 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.7 hours and the amount of time spent alone is normally distributed. We randomly survey one Mercurian 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to 4 decimal places if...
On the planet of Mercury, 4-year-olds average 2.9 hours a day unsupervised. Most of the unsupervised...
On the planet of Mercury, 4-year-olds average 2.9 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.6 hours and the amount of time spent alone is normally distributed. We randomly survey one Mercurian 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to 4 decimal places where...
A study found that the mean amount of time cars spent in drive-throughs of a certain...
A study found that the mean amount of time cars spent in drive-throughs of a certain fast-food restaurant was 138.6 seconds. Assuming drive-through times are normally distributed with a standard deviation of 30 seconds, complete parts (a) through (d) below. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). (a) What is the probability that a randomly selected car will get through the restaurant's drive-through in less...
A college research group reported that 46% of college students aged 18-24 would spend their spring breaks relaxing at h...
A college research group reported that 46% of college students aged 18-24 would spend their spring breaks relaxing at home Complete parts a through d below 2009. A sample of 150 college students was selected. a. Calculate the standard error of the proportion. (Round to four decimal places as needed.) b. What is the probability that less than 40% of the college students from the sample spent their spring breaks relaxing at home? P(Less than 40% of the college students...
The amount of time adults spend watching television is closely monitored by firms because this helps to determine adver...
The amount of time adults spend watching television is closely monitored by firms because this helps to determine advertising pricing for commercials. Complete parts (a) through (d). (b) According to a certain survey, adults spend 2.25 hours per day watching television on a weekday. Assume that the standard deviation for "time spent watching television on a weekday" is 1.93 hours. If a random sample of 60 adults is obtained, describe the sampling distribution of x, the mean amount of time...
The amount of time adults spend watching television is closely monitored by firms because this helps...
The amount of time adults spend watching television is closely monitored by firms because this helps to determine advertising pricing for commercials. Complete parts (a) through (d). (a) Do you think the variable weekly time spent watching television would be normaly distributed? If not, what shape would you expect the variable to have? O A The variable weekly time spent watching television is likely normally distributed OB. The variable weekly time spent watching television is kely skewed right not normally...
23. Statistics Canada cross-classified 400 18-24 year olds as to whether or not they attended university...
23. Statistics Canada cross-classified 400 18-24 year olds as to whether or not they attended university in 2001 and what income group their parents belong to. They wanted to see if university attendance depends on parents income. The results are shown below. Parent's Income Below $50,000 $50,000 - $100,000 Above $100,000 Total Attended Yes 20 73 27 120 University? No 80 167 33 280 400 Total 100 240 60 (a) What percentage of 18-24 year olds has parents whose income...
Please write neatly ? Problem 4 Four-year-olds in China average 5 unsupervised hours per day. Most...
Please write neatly ?
Problem 4 Four-year-olds in China average 5 unsupervised hours per day. Most of the unsupervised children live in rural areas, considered safe. Suppose that the amount of unsupervised time is normally distributed with standard deviation 1 A Chinese 4-year-old is randomly selected from a rural area. We are interested in the amount of time the child spends alone per day. In each appropriate box you are to enter either a rational number in "p/q" format or...
On the planet of Mercury, 4-year-olds average 2.9 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.6 hours and the amount of time spent alone is normally distributed. We randomly survey one Mercurian 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to 4 decimal places where...
A study found that the mean amount of time cars spent in drive-throughs of a certain fast-food restaurant was 138.6 seconds. Assuming drive-through times are normally distributed with a standard deviation of 30 seconds, complete parts (a) through (d) below. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). (a) What is the probability that a randomly selected car will get through the restaurant's drive-through in less...
A college research group reported that 46% of college students aged 18-24 would spend their spring breaks relaxing at home Complete parts a through d below 2009. A sample of 150 college students was selected. a. Calculate the standard error of the proportion. (Round to four decimal places as needed.) b. What is the probability that less than 40% of the college students from the sample spent their spring breaks relaxing at home? P(Less than 40% of the college students...
The amount of time adults spend watching television is closely monitored by firms because this helps to determine advertising pricing for commercials. Complete parts (a) through (d). (b) According to a certain survey, adults spend 2.25 hours per day watching television on a weekday. Assume that the standard deviation for "time spent watching television on a weekday" is 1.93 hours. If a random sample of 60 adults is obtained, describe the sampling distribution of x, the mean amount of time...
The amount of time adults spend watching television is closely monitored by firms because this helps to determine advertising pricing for commercials. Complete parts (a) through (d). (a) Do you think the variable weekly time spent watching television would be normaly distributed? If not, what shape would you expect the variable to have? O A The variable weekly time spent watching television is likely normally distributed OB. The variable weekly time spent watching television is kely skewed right not normally...
23. Statistics Canada cross-classified 400 18-24 year olds as to whether or not they attended university in 2001 and what income group their parents belong to. They wanted to see if university attendance depends on parents income. The results are shown below. Parent's Income Below $50,000 $50,000 - $100,000 Above $100,000 Total Attended Yes 20 73 27 120 University? No 80 167 33 280 400 Total 100 240 60 (a) What percentage of 18-24 year olds has parents whose income...
Please write neatly ?
Problem 4 Four-year-olds in China average 5 unsupervised hours per day. Most of the unsupervised children live in rural areas, considered safe. Suppose that the amount of unsupervised time is normally distributed with standard deviation 1 A Chinese 4-year-old is randomly selected from a rural area. We are interested in the amount of time the child spends alone per day. In each appropriate box you are to enter either a rational number in "p/q" format or...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago