Calculus and Above

Calculus Questions? Ask a Mathematician for Answers ASAP

Connect one-on-one with {0} who will answer your question

Find the expectation and variance...

Find the expectation and variance of . (If necessary, consult a list of formulas.)

Show More

Show Less

Was this answer helpful?

Describe your issueThe assistant will guide you

Chat 1:1 with a tutorLicensed Experts are available 24/7

100% satisfaction guaranteeGet all the answers you need

Related Calculus and Above Questions

Researchers interested in determining the relative

Researchers interested in determining the relative effectiveness of two different drug treatments on people with a chronic illness established two independent test groups. The first group consisted of… read more

A machine that manufactures automobile pistons is estimated

A machine that manufactures automobile pistons is estimated to produce a defective piston of the time. Suppose that this estimate is correct and that a random sample of pistons produced by this machin… read more

Let be a random variable with the following probability

Let be a random variable with the following probability distribution: Value of 20 0.35 30 0.30 40 0.10 50 0.25 Find the expectation and variance of . (If necessary, consult a list of formulas.)… read more

The ages (in years) of the 5 doctors at a local clinic are

The ages (in years) of the 5 doctors at a local clinic are the following. 50, 35, 43, 39, 43 Assuming that these ages constitute an entire population, find the standard deviation of the population. Ro… read more

Let be a random variable with the following probability

Let be a random variable with the following probability distribution: Value of 30 0.40 40 0.05 50 0.40 60 0.15 Find the expectation and variance of . (If necessary, consult a list of formulas.)… read more

Suppose that the New England Colonials baseball team is

Suppose that the New England Colonials baseball team is equally likely to win any particular game as not to win it. Suppose also that we choose a random sample of 30 Colonials games. Estimate the numb… read more

The lifetime of a certain brand of electric light bulb is

The lifetime of a certain brand of electric light bulb is known to have a standard deviation of 53 hours. Suppose that a random sample of 90 bulbs of this brand has a mean lifetime of 483 hours. Find … read more

A psychologist is interested in the mean IQ score of a given

A psychologist is interested in the mean IQ score of a given group of children. It is known that the IQ scores of the group have a standard deviation of 15. The psychologist randomly selects 50 childr… read more

An ecologist randomly samples 15 plants of a specific

An ecologist randomly samples 15 plants of a specific species and measures their heights. He finds that this sample has a mean of 18 cm and a standard deviation of 2 cm. If we assume that the height m… read more

The mean diastolic blood pressure for a random sample of 60

The mean diastolic blood pressure for a random sample of 60 people was 87 millimeters of mercury. If the standard deviation of individual blood pressure readings is known to be 8 millimeters of mercur… read more

The ages (in years) of the 5 doctors at a local clinic are

The ages (in years) of the 5 doctors at a local clinic are the following. 42, 31, 42, 41, 44 Send data to Excel Assuming that these ages constitute an entire population, find the standard deviation of… read more

The following are distances (in miles) traveled to the

The following are distances (in miles) traveled to the workplace by 5 employees of a certain university. 22, 31, 32, 24, 6 Find the standard deviation of this sample of distances. Round your answer to… read more

The monthly salaries (in thousands of dollars) of a sample

The monthly salaries (in thousands of dollars) of a sample of 6 sales representatives are as follows: 11, 12, 6, 7, 9, 9 Find the standard deviation of this sample of monthly salaries. Round your answ… read more

Below are the times (in days) it takes for a sample of 6

Below are the times (in days) it takes for a sample of 6 customers from Linda's computer store to pay their invoices. 38, 35, 29, 44, 13, 39 Find the standard deviation of this sample of times. Round … read more

Petroleum pollution in oceans stimulates the growth of

Petroleum pollution in oceans stimulates the growth of certain bacteria. An assessment of this growth has been made by counting the bacteria in each of 5 randomly chosen specimens of ocean water (of a… read more

Suppose that 16 % of the population of the U.S. is

Suppose that 16 % of the population of the U.S. is left-handed. If a random sample of 160 people from the U.S. is chosen, approximate the probability that at most 26 are left-handed. Use the normal ap… read more

The scores on an examination in biology are approximately

Second opinion] The scores on an examination in biology are approximately normally distributed with mean 500 and an unknown standard deviation. The following is a random sample of scores from this exa… read more

Suppose that of the people in a large city have used a

Suppose that of the people in a large city have used a hospital emergency room in the past year. If a random sample of people from the city is taken, approximate the probability that fewer than used a… read more

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Ask-a-doc 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.

...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 work-from-home 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.

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

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!!!!

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.

Hesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

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.

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.

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.

Dallas, TX

< Previous | Next >

Mr. Gregory White

Master's Degree

114 satisfied customers

M.A., M.S. Education / Educational Administration

SusanAthena

Master's Degree

102 satisfied customers

Tutor for Algebra, Geometry, Statistics. Explaining math in plain English.

Dr Arthur Rubin

Doctoral Degree

96 satisfied customers

Ph.D. in Mathematics, 1978, from the California Institute of Technology, over 20 published papers

rajeevanpillai

Master's Degree

94 satisfied customers

B.Sc Mathematics and M.Sc, M Phil Statistics

JACUSTOMER-yrynbdjl-

Master's Degree

42 satisfied customers

I have a MS in Mathematics and I have taught Mathematics for 10 years at the college level.

dhouse1940

Master's Degree

33 satisfied customers

BS mathematics, MS biostatistics, 35+ yrs designing & analyzing biological experiments.

Don

Master's Degree

29 satisfied customers

M.S. Astronautical Engineering. Math/Sci/Comp Tutor

< Previous | Next >

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.