Login

Contact Us
Calculus and Above
Calculus Questions? Ask a Mathematician for Answers ASAP
Not a Calculus and Above Question?
How JustAnswer Works:
Ask an Expert
Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
Get a Professional Answer
Via email, text message, or notification as you wait on our site.
Ask follow up questions if you need to.
100% Satisfaction Guarantee
Rate the answer you receive.
Ask Sandhya_sharma Your Own Question
Sandhya_sharma
,
Master's Degree
Category:
Calculus and Above
Satisfied Customers:
3631
Experience:
I hold M.Sc and M.Phil degrees in math and have several years of teaching experience.
14910578
Type Your Calculus and Above Question Here...
Sandhya_sharma is online now
TCO 6) Horse race time is found to be normally distributed
Resolved Question:
TCO 6) Horse race time is found to be normally distributed with a mean value of 10 minutes and a standard deviation of 2 minutes. Horses whose race time is in the top 5% will not be eligible to participate in a second round. What is the lowers race time that makes a horse losses his eligibility to participate in a second round? (Points : 6)
13.29
12
6.71
15.29
A Mall manager claims that in average every customer spends $52 per a single visit to the mall. To test this claim, you took a sample of 36 customers and found the sample mean to be $55 and the sample standard deviation to be $12. At alpha = 0.05, test the Mall’s manager claim. Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results. (Points : 20)
A bank manager wanted to estimate the mean number of transactions businesses make per month. For a sample of 60 businesses, he found the mean number of transaction per month to be 38 and the standard deviation to be 8.5 transactions.
(a) Find a 95% confidence interval for the mean number of business transactions per month. Show your calculations and/or explain the process used to obtain the interval.
(b) Interpret this confidence interval and write a sentence that explains it. (Points : 20)
A company’s CEO wanted to estimate the percentage of defective product per shipment. In a sample containing 400 products, he found 25 defective products.
(a) Find a 95% confidence interval for the true proportion of defective product. Show your calculations and/or explain the process used to obtain the interval.
(b) Interpret this confidence interval and write a sentence that explains it. (Points : 20)
The ages of 10 students are listed in years:{ 18,20,27,24,29,21,28,19,22,28}
(a) Find the mean, median, mode, sample variance, and range.
(b) Do you think that this sample might have come from a normal population? Why or why not? (Points : 20)
Submitted:
2 years ago.
Category:
Calculus and Above
Share this conversation
Expert:
Sandhya_sharma
replied 2 years ago.
Hi,
I have started work on these questions.
I will send answers within 2025 minutes from now.
Thanks
Ask Your Own Calculus and Above Question
Customer:
replied 2 years ago.
thank you
Expert:
Sandhya_sharma
replied 2 years ago.
You are most welcome!
Ask Your Own Calculus and Above Question
Expert:
Sandhya_sharma
replied 2 years ago.
Here are the solutions:
TCO 6) Horse race time is found to be normally distributed with a mean value of 10 minutes and a standard deviation of 2 minutes. Horses whose race time is in the top 5% will not be eligible to participate in a second round. What is the lowers race time that makes a horse losses his eligibility to participate in a second round? (Points : 6)
13.29
12
6.71
15.29
Answer: 13.29
A Mall manager claims that in average every customer spends $52 per a single visit to the mall. To test this claim, you took a sample of 36 customers and found the sample mean to be $55 and the sample standard deviation to be $12. At alpha = 0.05, test the Mall’s manager claim. Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results. (Points : 20)
Solution:
Null Hypothesis: H0: µ = 52
Alternate Hypothesis H1: µ ≠ 52
Test statistic: z = (5552)/(12/sqrt(36)) = 1.5
Critical zvalues = 1.96, 1.96
Since calculated test statistics does not fall in rejection region so we fail to Reject Null hypothesis. Thus there is enough evidence to support manager’s claim that in average every customer spends $52 per a single visit to the mall.
A bank manager wanted to estimate the mean number of transactions businesses make per month. For a sample of 60 businesses, he found the mean number of transaction per month to be 38 and the standard deviation to be 8.5 transactions.
(a) Find a 95% confidence interval for the mean number of business transactions per month. Show your calculations and/or explain the process used to obtain the interval.
Solution:
95% confidence interval will be
= (38 1.96*8.5/sqrt(60), 38+ 1.96*8.5/sqrt(60))
= (35.85, 40.15)
(b) Interpret this confidence interval and write a sentence that explains it. (Points : 20)
Solution:
It means that we are 95% confident that the true mean number of transactions per month is between 35.85 and 40.15.
A company’s CEO wanted to estimate the percentage of defective product per shipment. In a sample containing 400 products, he found 25 defective products.
(a) Find a 95% confidence interval for the true proportion of defective product. Show your calculations and/or explain the process used to obtain the interval.
Solution:
phat = 25/400 = 0.0625
95% confidence interval for the true proportion of defective product will be
=(0.0625 – 1.96*sqrt(0.0625*(10.0625)/400), 0.0625 + 1.96*sqrt(0.0625*(10.0625)/400))
= (0.0388, 0.0862)
(b) Interpret this confidence interval and write a sentence that explains it. (Points : 20)
Solution:
It means that we are 95% confident that the true proportion of defective product lies between 0.0388 and 0.0862.
The ages of 10 students are listed in years:{ 18,20,27,24,29,21,28,19,22,28}
(a) Find the mean, median, mode, sample variance, and range.
Mean = 23.6
Median = 23
Mode = 28
Range = 11
Sample variance = 17.16
(b) Do you think that this sample might have come from a normal population? Why or why not? (Points : 20)
Since the mean and the median are approximately the same, this sample might have come from a normal population.
Please don't forget to click ACCEPT. BONUS is always appreciated.
Thanks
Sandhya_sharma, Master's Degree
Category:
Calculus and Above
Satisfied Customers:
3631
Experience:
I hold M.Sc and M.Phil degrees in math and have several years of teaching experience.
Sandhya_sharma and 2 other Calculus and Above Specialists are ready to help you
Ask your own question now
Share this conversation
JustAnswer in the News:
Askadoc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses workfromhome jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
What Customers are Saying:
Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.
Mary C.
Freshfield, Liverpool, UK
<
Last

Next
>
Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.
Mary C.
Freshfield, Liverpool, UK
This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!
Alex
Los Angeles, CA
Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.
GP
Hesperia, CA
I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.
Justin
Kernersville, NC
Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.
Esther
Woodstock, NY
Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.
Robin
Elkton, Maryland
He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.
Diane
Dallas, TX
Meet The Experts:
SusanAthena
Master's Degree
Satisfied Customers:
98
Tutor for Algebra, Geometry, Statistics. Explaining math in plain English.
<
Last

Next
>
http://ww2.justanswer.com/uploads/homeworklady/20081124_125231_susannewavatar.jpg
SusanAthena's Avatar
SusanAthena
Master's Degree
Satisfied Customers:
98
Tutor for Algebra, Geometry, Statistics. Explaining math in plain English.
http://ww2.justanswer.com/uploads/ED/educatortech/201267_1256_williams4.64x64.jpg
Mr. Gregory White's Avatar
Mr. Gregory White
Master's Degree
Satisfied Customers:
93
M.A., M.S. Education / Educational Administration
http://ww2.justanswer.com/uploads/CO/CosumelEyes/201254_4923_Profile.64x64.jpg
Ray Atkinson's Avatar
Ray Atkinson
Bachelor's Degree
Satisfied Customers:
45
Degrees in Math, Education and Accounting, years and years of tutoring.
http://ww2.justanswer.com/uploads/SO/sonofGauss/201266_20151_PortraitLHW.64x64.jpg
JACUSTOMERyrynbdjl's Avatar
JACUSTOMERyrynbdjl
Master's Degree
Satisfied Customers:
42
I have a MS in Mathematics and I have taught Mathematics for 10 years at the college level.
http://ww2.justanswer.com/uploads/dhouse1940/20100902_133023_DSCN2406.jpg
dhouse1940's Avatar
dhouse1940
Master's Degree
Satisfied Customers:
33
BS mathematics, MS biostatistics, 35+ yrs designing & analyzing biological experiments.
http://ww2.justanswer.com/uploads/AR/arubin9/201224_42617_ArthurRubinedit.64x64.jpg
Dr Arthur Rubin's Avatar
Dr Arthur Rubin
Doctoral Degree
Satisfied Customers:
32
Ph.D. in Mathematics, 1978, from the California Institute of Technology, over 20 published papers
http://ww2.justanswer.com/uploads/DO/Donbacongamer/201236_2337_mathmaster.64x64.jpg
Don's Avatar
Don
Master's Degree
Satisfied Customers:
29
M.S. Astronautical Engineering. Math/Sci/Comp Tutor
Related Calculus and Above Questions
Question
Date Submitted
hi i need my questions to be answered
11/20/2014
11/20/2014
Ryan
hi, are you really there?
11/19/2014
11/19/2014
Ryan
15 Math Multiple Choice Statistics questions. Will attach.
11/16/2014
11/16/2014
Ryan
41. If we fail to reject the null hypothesis, ________.
11/15/2014
11/16/2014
Ryan
31. The rejection region is defined by ________. (Points :
11/15/2014
11/16/2014
Ryan
Question 11.11. The time required to travel downtown at 10
11/15/2014
11/15/2014
SusanAthena
1. Numerical facts and figures that are collected through
11/15/2014
11/15/2014
SusanAthena
Springdale Shopping Survey (70 Points) The major shopping
11/14/2014
11/14/2014
Ryan
Use Probability Tables where applicable1) The electric
11/12/2014
11/12/2014
Ryan
I have this assignment due today and I just can't make sense
11/11/2014
11/11/2014
Ryan
Chat Now With A Tutor
Sandhya_sharma
Tutor
3631 Satisfied Customers
I hold M.Sc and M.Phil degrees in math and have several years of teaching experience.
X
Ask a Tutor
Get a Professional Answer. 100% Satisfaction Guaranteed.
132 Tutors are Online Now
Type Your Calculus and Above Question Here...
characters left: