Thursday

January 29, 2015

January 29, 2015

Number of results: 11,684

**math**

Benadryl is on sell this week for 20% off of the normal selling price at $10.00 per unit. If the pharmacy purchased Benadryl at $8.00 per unit, what is the gross profit percentage?
*July 28, 2014 by cham*

**Physics **

How Many Capillaries? The aorta has an inside diameter of approximately 2.1 cm, compared to that of a capillary, which is about 1.0×10−5m (10 μm). In addition, the average speed of flow is approximately 1.0 m/s in the aorta and 1.0 cm/s in a capillary Assuming that ...
*April 17, 2014 by Brady*

**Chem.**

Ethanol has a heat of vaporization of 38.56 KJ/Mol. And a normal boiling point of 78.4 degrees celcius. WHAT is the vapor pressure of ethanol at 18 degrees celcius??
*February 10, 2010 by Joseph*

**Chemistry**

the vapor pressure of ethanol at its normal boiling point would be 1)80 kPa 2)101.2 kPa 3)273 kPa 4)373 kPa would it be 1 ?
*February 24, 2011 by Hannah*

**math **

the rate of return for an investment can be described by a normal distribution with mean 22% and standard deviation 3%. what is the probability that the rate of return for the investment will be at least 15%?
*April 27, 2011 by Carola *

**education**

Behavioral objectives clearly stated A. What the children will actually do B. How children should behave C. What children are interested D.the range of normal behavioral for children
*September 22, 2012 by phillip*

**Statistics**

True or False If a sample of at least 30 scores is randomly selected from a normal population, the sample mean will be equal to the population mean.
*December 9, 2013 by Lyndyc*

**Chemistry**

Calculate the normal boiling point of a compound that has a vapor pressure of 19.30kPa at 167 Fahrenheit and a vapor pressure of 1.86kPa at 77 Fahrenheit.
*January 27, 2015 by Annonymous*

**science**

5. The Papanicolaou test is used to detect A. conization in situ. C. minimal cervical dysplasia. B. protein in the urine. D. colonic polyposis. 6. The function of the antidiuretic hormone is to A. retain water for the body’s use. B. begin digestion of carbohydrates during ...
*November 12, 2010 by JALL SHAW*

**health**

Children's Hospital in Boston, Massachusetts, has long been considered an outstanding medical center specializing in the diagnosis and treatment of pediatric problems. This facility is linked academically to the Harvard University Medical School. Conduct a brief SWOT analysis ...
*May 7, 2011 by Anonymous*

**Physics**

1) The speed of light in a certain liquid is 3/5 the speed in a vacuum. What is the index of refraction of the liquid? 2) A ray of light strikes a piece of glass (n=1.52) and makes an angle of 50 degrees with the surface. What angle does the refracted ray make with the surface...
*February 16, 2011 by Ninzy*

**Physics**

1) The speed of light in a certain liquid is 3/5 the speed in a vacuum. What is the index of refraction of the liquid? 2) A ray of light strikes a piece of glass (n=1.52) and makes an angle of 50 degrees with the surface. What angle does the refracted ray make with the surface...
*February 16, 2011 by Ninzy*

**health science please ASAP**

2. One of the purposes of sweat glands is to release waste products, such as water and _____. (1 point) blood dirt sugar salt 11. A human baby develops inside the mother’s _________ for ______ months. (1 point) vagina; six pelvis; one uterus; nine ovary; eight My answers: 2. ...
*March 13, 2013 by Delilah*

**Psychology**

As a scientist,Carl is concerned with the intensity of lights in the modern human environment.In his research project,Group A consists of volunteers who have agreed to sleep each night for a week with a 150 watt light bulb hanging over their bed.Group C will sleep in their ...
*July 5, 2012 by Sandra*

**History-Ms.Sue**

SraJMcGin read this but he didn't help me out. Pro-war & religion ( Rememeber I'm against global peace) Is this right at all and what else can I add because I need a couple more sentences. Thanks A few people feel that they believe in the only right religion and that people of...
*April 1, 2009 by Kara*

**History**

Which of the following is NOT something a geographer can explain to a historian? A.why people populated certain areas B.how people change their environment C.how the environment changes people D.why people like other people I know is D but i need accurate answer
*February 13, 2012 by Sariah*

**Qualities**

If people like firemen risk their lives to save their country, homes. What qualities would they be considered to have, what would you say about them? You would say that they are brave, and sweet to care for their country and save others. please more ideas.
*April 20, 2011 by Anonymous*

**13**

Children and adolescents are considered to be reflected in which age group? A. 6-17 years old B. 3-17 years old C. 5-17 years old D. 10-17 years old c
*March 4, 2012 by desha*

**math,algebra**

Can someone help me set this up to solve or what should i do because i have no clue. thanks. Some scientists believe there is a limit to how long humans can live.* One supporting argument is that during the last century, life expectancy from age 65 has increased more slowly ...
*May 25, 2007 by mathstudent05*

**Science**

The normal recommended amount of vitamin c is 1,000 milligrams(mg) per day for non-pregnant woman. During pregnancy, how much Vitamin C does a pregnant woman need?
*January 11, 2010 by Tiffany*

**anatomy and physiology**

Bone mineral density scans are required to detect early signs of osteoporosis because normal x-rays don't detect it until what percent of bone density is gone?
*October 31, 2010 by Stacie*

**Physics**

A block of mass 2.10 kg is pushed 2.33 m along a frictionless horizontal table by a constant 19.4 N force directed 27.5o below the horizontal. Determine the magnitude of the normal force exerted by the table.
*February 7, 2011 by Megan*

**Physics**

A block of mass 2.10 kg is pushed 2.33 m along a frictionless horizontal table by a constant 19.4 N force directed 27.5o below the horizontal. Determine the magnitude of the normal force exerted by the table.
*February 7, 2011 by Megan*

**Physics**

A block of mass 2.10 kg is pushed 2.33 m along a frictionless horizontal table by a constant 19.4 N force directed 27.5o below the horizontal. Determine the magnitude of the normal force exerted by the table.
*February 7, 2011 by Megan*

**math**

the tangent yo the curve y=x^2 +5x -2 @ the point (1,4)intersect the normal to the same curve @ the point (-3,-8) at the point P.Find the coordinates of point P.[ans: -1/3,-16/3] just give me some hint to calculate this solution.
*July 22, 2011 by rob*

**chemistry**

a sample of water under study was found to boil at 102 degree Celsius at normal temperature and pressure. is the water pure ? will it freeze at 0 degree Celsius? comment ....
*August 23, 2011 by Anonymous*

**Biology**

Suppose that a clolur blind man has parents with normal vision. Would all his sons be colour-blind ? Was his mother a carrier ? would all his daughters be carriers
*October 26, 2011 by Melissa*

**Statics**

Assume that the population is normal. A sample of size 100 is taken. The resultant sample data has a mean of 48 and a standard deviation of 15. Construct the 99% confidence interval for the population mean.
*December 2, 2012 by Heather*

**Chemistry**

The following thermodynamic data was obtained for an unknown compound. Delta Hvap = 31.3 kj/mol and Delta S Vap= 79.7 kj/mol .Calculate the normal boiling point of this compound in Celcius.. Thank you!
*April 29, 2013 by Chloe*

**Physics - ice skating**

An ice skater pulls three small children, one behind the other, with masses 25kg, 31kg, and 35kg. Assume that the ice is smooth enough to be considered frictionless. If the skater is holding onto the 25kg child, find the tension in the arms of the next child in line.
*August 5, 2010 by Shaila*

**Chemistry**

1. What happens if our calorimeter is not properly insulated..what effect will it have on our calculated specific heat capacity I.e too large, too small or no effect....explain. 2. If our partner forgot to cover the coffee cup calorimeter while the temperature was being ...
*November 18, 2014 by Precious*

**please help statics**

I have to come up with a statics problems. i have to make up a problem and take photos that includes a frame or machines. Machines, like those tractor machines or amusement ride. For a frame though, is a step stool that folds considered as a frame. The sides are connected and ...
*November 18, 2008 by jen*

**foundationd of personal finance**

. List two ways to begin putting aside money for investments. You can often save money by making small changes. Share one tip you think may help save some money in the long-run.
*February 18, 2011 by Anonymous*

** Just Curious**

A few questions out of curiosity. What does jiskha mean? And what is your view point of Pluto Since Pluto is no longer considered a planet, do you think it should still e called a planet? Not just dwarf planet, but a planet like Mars or Earth? Thanks and sorry for any bother...
*April 10, 2012 by ♥rebel•stupidity=kathy♥*

**Chemistry**

We had to calculate the resolution between to peaks resulting from an HPLC assay using an internal standard for determination of an analyte "x". I came up with 2.6, which is considered good resolution. Now we are supposed to calculate the concentration of the unknown assuming ...
*April 16, 2013 by Maranda*

**english**

True or False: To talk in an abstract manner is to use easily understandable, concrete terms. I think it is false? I think so, too. I think Writeteacher answered this below, but yes, I think it's false too. The words abstract and concrete are generally considered antonyms, so ...
*September 13, 2006 by anonymous*

**English**

I left out these two sentences. Thank you very much. 1) Every noise scares Macbeth. He fears that his guilty hands will pluck out his eyes. (What does this sentence mean? 2) He would like his eyes to be removed so that he won't have to see the blood and therefore acknowledge ...
*November 1, 2011 by Henry2*

**Chemistry**

The normal boiling point of ethanol is 78.4°C. When 9.16 g of a soluble nonelectrolyte was dissolved in 100. g of ethanol, the vapor pressure of the solution at that temperature was 7.40 102 Torr. (a) What are the mole fractions of ethanol and solute? (b) What is the molar ...
*December 10, 2010 by Daiyo*

**Statistics**

A telephone company receives 3 calls every minute on an average. If an operator has a watch that is not very accurate and which has a normal distribution with mean of 1 minute and standard deviation of 5 seconds, what is the probability that he measures 5 calls in a minute?
*February 4, 2011 by Georgina Hughes*

**statistics**

A study is discussed the purity of oxygen from a certain supplier. Assume that the mean was 99.61 with a standard deviation of 0.08. Assume that the distribution of purity was normal. Below what purity value would you expect to represent the smallest 25% of the population?
*December 16, 2011 by shasha*

**Physics**

A box is being with a velocity v by a force P (parallel to to v) along a level horizontal floor. the normal force is Fn, the kinetic frictional force if fk, and the weight of the box is mg. Decide which forces do positive, zero or negative work and why?
*February 12, 2012 by Nilan*

**Physics**

A box is being moved with a velocity (v) by a force (p)(parallel to v) along a level horizontal floor. The normal force is (Fn), the kinetic frictional force is (fk), and the weight of the is box is (mg). Draw a free-body diagram of this situation
*February 13, 2012 by Amy*

**Economics**

Due to an increase in her rent, Isa needs to cut back her spending on other items. Which of the following types of goods will Isa consume less of? A. substitutes B. normal goods C. inferior goods D. complements
*April 12, 2012 by Zach Ketchup *

**Statistics**

A random sample of customer incomes yields a mean income of $35000 with a standard deviation of $4500. Assume that the distribution of the incomes in normal. What income range would include 90% of the most popular incomes?
*August 2, 2012 by Danielle*

**biomechanic/physics**

, what effect on Flim was produced by a) changing the nature of the surfaces, b) changing the normal force, and c) changing the area of contact between the surfaces? Be sure to cite specific results that support your responses to parts a-c.
*September 23, 2013 by meder*

**Physics**

The Ladder is 5 m long and weighs 180N. The guy weighs 800N, and stops 1m horizontally up the ladder. The bottom of the ladder rest on a horizontal stone ledge at 53.1 degree. Find the normal and he frictional force at the base. HELP!!!
*November 3, 2013 by Anonymous*

**Physics**

The Ladder is 5 m long and weighs 180N. The guy weighs 800N, and stops 1m horizontally up the ladder. The bottom of the ladder rest on a horizontal stone ledge at 53.1 degree. Find the normal and he frictional force at the base. HELP!!!
*November 3, 2013 by Anonymous*

**Statistics **

Random samples of size n = 90 were selected from a binomial population with p = 0.4. Use the normal distribution to approximate the following probabilities. (Round your answers to four decimal places.) (a) P(p̂ ≤ 0.49) = (b) P(0.37 ≤ p̂ ≤ 0.49) = ...
*November 3, 2014 by Tyler*

**Statistics**

The age of customers for a particular retail store follows a normal distribution with a mean of 37.5 years and a standard deviation of7.6 years.What is the probability that the next customer who enters the store will be less than 42 years old?
*January 3, 2015 by Leslie Meagan*

**accounting**

Central States Manufacturing produces a single product: Product 1222. The company has estimated that annual overhead expenses wll be $180,000 and production volume will be 20,000 units using 20,000 hours of labor. Overhead is applied to production based on assembly labor hours...
*June 22, 2012 by Lisa*

**History**

By 1992, historical accounts of Columbus’s “discovery” of America differed markedly from those written in 1892, although few “new” facts about Columbus had been unearthed. Explain at least three changes in perspective that led to historians’ altered assessments.
*October 24, 2014 by History *

**math**

The FunTime Amusement park customer load during the summer follows a normal distribution with mean 450 and standard deviation 80. Determine the probability that the number of customers on any given day during the summer will be less than 420.
*September 29, 2009 by Matt*

**computers**

Determine the functional dependencies that exist in the following table; then convert this table to an equivalent collection of tables that are in third normal form: Marina, (MarinaNum, Name, (SlipNum, Length, RentalFee, BoatName) ) *Note MarinaNum is underlined
*February 15, 2010 by Matt*

**math 12**

In his best year, Mickey Mantles batting average was o.365. In that year, what was the probability that he would get exactly 5 hits in 15 times at bat? Compare the results from the normal approximation with teh results from a calculation using a binomial distribution
*January 19, 2011 by kitkat*

**math 12**

In his best year, Mickey Mantles batting average was o.365. In that year, what was the probability that he would get exactly 5 hits in 15 times at bat? Compare the results from the normal approximation with teh results from a calculation using a binomial distribution
*January 23, 2011 by kitkat*

**Physics Question**

Some rearview mirrors produce images of cars behind you that are smaller than they would be if the mirror were flat. What is a mirror's radius of curvature if cars 23.0 m away appear .36x their normal size? I got .24 meters but it is wrong??
*April 15, 2012 by ###Nadine####*

**physics**

A ray of light is incident at an angle of 20degrees to the normal on one face of an equilateral prismm made in glass of refractive index 1.523. Trace the ray of light through the prism and find the total deviation produced.
*October 28, 2012 by Please help- Elena*

**CALCULUS-GUYS..PLEASE HELP...THIS DUE TOMORROW..**

An automobile travels at a constant speed around a curve whose radius of curvature is 2000m. What is the maximum allowable speed if the maximum acceptable value for the normal scalar component of acceleration is 1.5m/s^2?
*April 24, 2013 by aimi najwa*

**Stat**

Thirty randomly selected students took the calculus final. If the sample mean was 89 and the standard deviation was 6.2, construct a 99% confidence interval of the mean score of all students. Assume that the population has a normal distribution. what formula do i use????
*September 30, 2014 by Billy*

**six sigma**

If the mean value of the weight of a particular brand of dog food bag is 20.6 pounds and the standard deviation is 1.3, assume a normal distribution and calculate the percentage of bags that falls below the lower specification value of 19.7 pounds.
*November 26, 2014 by stansler*

**Calculus**

Determine the intersection, if any, of the planes with equations x + y - z + 12 = 0 and 2x + 4y - 3z + 8 = 0. I have no clue where to even begin. If someone could help and give me the steps to complete it, that would be greatly appreciated. Do I have to first simplify the ...
*December 18, 2014 by Ad*

**Calculus**

Determine the intersection, if any, of the planes with equations x + y - z + 12 = 0 and 2x + 4y - 3z + 8 = 0. I have no clue where to even begin. If someone could help and give me the steps to complete it, that would be greatly appreciated. Do I have to first simplify the ...
*December 18, 2014 by Ad*

**accounting**

Accountants follow ethical guidelines in the conduct of their work. What are these guidelines made for? Why are ethical principles considered important? In the event the accountants do not follow the ethical principles what do you think the effect would be?
*April 17, 2011 by saidi*

**math-urgent**

Newton’s Law of Cooling states that the temperature of a heated object decreases exponentially over time toward the temperature of the surrounding medium. The temperature u of a heated object at a given time t can be modeled by the following function: u(t)=T+(u-T)e^kt K<0...
*December 4, 2012 by sandy*

**us history intro and conclusion**

i posted earlier about my DBQ for my us history class, and i just need to know how i should go about opening and closing what i am saying. it's the only part i have trouble on. heres the question again: In what ways and to what extent did constitutional and social ...
*March 4, 2007 by nina*

**calculus: multivariable**

Find the points on the hyperboloid x2 −y2 +2z2 = 1 where the normal line is parallel to the line that joins the points (3,−1, 0) and (5, 3, 6). Please show me how to do it..the answer is [+- rad 6/(3), +- 2rad 6/(3), +- rad6/(3)]
*May 3, 2008 by sara*

**statistics**

The researcher wanted to test the hypothesis that Ho: μ=3, knowing the population, which was normal, had a variance of 1.00. -- How powerful would this test be against the alternative hypothesis that Ha: μ=4, given that n=15, α = .05
*June 4, 2008 by Lezlie*

**chemistry**

The vapor pressure of dichloromethane, CH_2Cl_2, at 0 degrees celcius is 134 mmHg. The normal boiling point of dichloromethane is 40 degrees celcius. Calculate its molar heat of vaporization (in kJ/mol).
*January 31, 2010 by jack*

**chemistry**

Assume you drank 240mL of coffee at 80degrees C and that this amount was cooled by your body to the normal 37 degrees C. How many calories were supplied to your body? Assume that the coffee is essentially hot water with a density of 1.0g/mL
*September 13, 2011 by Anonymous*

**statistics**

FB: Attendance at a university's basketball games follows a Normal distribution with mean ì = 8,000 and standard deviation ó = 1,000. 60% of all games will have more than _______ people in attendance.
*February 7, 2012 by Anonymous*

**statistics**

Suppose X has a mound-shaped distribution with sigma=9. A random sample of size 36 has a sample mean 20. Is it appropriate to use a normal distribution to compute a confidence interval for the population mean u?
*June 5, 2012 by Tracey*

**Anatomy**

Bone mineral density scans are required to detect early signs of osteoporosis because normal x-rays don't detect it until ____ percent of bone density is gone. A. 20 B. 30 C. 50 D. 80 I am thinking it is 30%.
*December 10, 2012 by Anonymous*

**Geometry**

On September 3, 1970 a hailstone with diameter 5.6in fell at Coffeyville, Kansas. It weighed about 0.018Ib/in^3 compared to the normal 0.033Ib/in^3 for ice. About how heavy was this Kansas hailstone?
*September 27, 2013 by George*

**statistics**

The following contingency table of frequencies is based on a five year study of fire fatalities in Maryland. For purposes of clarity, columns and rows are identified by the letters A-C and D-G respectively. Blood Alcohol Level of Victim Age A B C 0.00% 0.01-0.09% ¡Ý0.10% D 0-...
*February 15, 2009 by Stuart*

**Math**

For a period of time as an alligator grows, its mass is proportional to the cube of its length. When the alligator's length changes by 15.8%, its mass increases by 17.3kg. Find its mass at the end of this process.
*August 19, 2008 by Rob*

**Physical Education**

The possibility "What if we designed a school that acknowledged the physical changes that these students are going through." Discuss what that possibility might look like in a physical education setting
*January 25, 2009 by Sarah*

**chemistry**

If calcium oxide is added to sea water a number of changes occur. first calcium oxide reacts with water to form calcium hydroxide. What is the equations
*March 8, 2009 by mom*

**Math 156**

Jackie bought a stock for $34 a share. the daily changes for the next 7 days after she bought the stock were -5, -2, +1, +3, -6, +4 and +8. What was the share of stock worth at the end of day 7?
*November 20, 2009 by Rmz*

**Physics - Momentum**

Define momentum qualitatively and quanititatively. (qualitatively - a measure of an object's mass to resist changes in its velocity or acceleration. Is this correct? How do I define momentum quantitatively)
*August 25, 2010 by Shaila*

**8th Grade Writing**

Does this Introduction sound fine for an Argument essay? Forests probide many supplies that are essential in our lives. They give us oxygen, wood fiber for paper, herbs for medicine, and timber for building structures. Forest materials are so necessary that humans can't live ...
*October 22, 2010 by Elizabeth *

**Math--Statistics**

I have a couple of questions that need review--I've answered them, but I'm not sure if I'm correct. 1.)Suppose you interview 10 randomly selected workers and ask how many miles they commute to work. You'll compute the sample mean commute distance. Now imagine repeating the ...
*March 15, 2011 by Anonymous*

**Math**

A mathematical model for concentration of administered cortisone in humans over a 24-hour period uses the function C= [(D x a) / V(a-b)] (e^(-bt)-e^(-at) where C is the concentration, D is the dose given at time t=0, V is the volume of distribution (volume divided by ...
*February 13, 2014 by Meli*

**chem**

true or false?? a)If there are no changes in the oxidation state of the reactants or products of a particular reaction, that reaction is a redox reaction. false? b)A reducing agent gets oxidized as it reacts. true?
*May 3, 2011 by Rebekah*

**MATH **

the figure shows that the angle of elevation to the top of the building changes from 20 degree to 40 degree as an observer advances 75 feet toward the building. Find the height of the building to the nearest feet.
*December 6, 2011 by tom *

**Social Studies**

Could cattle ranchers have stopped the decline of the cattle industry that occurred in the late 1880's? My answer: No, because the decline of the cattle industry is due to changes in customer's interests?
*April 16, 2013 by Anonymous*

**Physics Problem**

Paleontologists estimate that if a Tyrannosaurus rex were to trip and fall, it would have experienced a force of approximately 260,000 N acting on its torso when it hit the ground. Question 1 Assuming the torso has a mass of 3800 kg , find the magnitude of the torso's upward ...
*September 23, 2009 by Cayla*

**statistics**

Can someone please explain to me the procedures for getting an answer to the questions. Step by step would be great since I'm very confused. I know it's probably simple. * Numerous studies have demonstrated that listening to music while studying can improve memory. To ...
*February 28, 2008 by Lily*

**Macro economics**

Between year 1 and 3 the price level has risen and real GDP has fallen. During the same time W has risen. Identify one comination of changes in the labor supply and labor demand that could have the effect in the classical goods and services market.
*February 15, 2008 by Christie*

**English IV Honors**

What is the best way to write a ten page term paper on fairy tales dealing with politics,changes in setting, and common fairy tale elements that are dropped and altered in the newer version of the tale Snow White and the Seven Dwarfs?
*November 12, 2008 by Tyisha*

**Psychology**

A remarkable change occurred in mental institutions during the late 1950s. Patients became less agitated and many became "out patients" rather than custodial patents. These noticeable changes were the results of: A. antidepressants. B. shock therapy. C. ECT. D. antipsychotic ...
*August 8, 2013 by Angela*

**Sociology**

give an example of a current technology of the post-industrial era that is changing the way family might be structured. Given your experience in an online environment, can you predict what changes in the family unit might occur due to the information age? could you explain to ...
*November 23, 2014 by 2phoneeeeee *

**Physiology**

Obesity is defined medically as 20% above a person’s ideal weight. If a person’s ideal weight is 72 kg, when (above what weight) would that person be considered obese? ________________kg
*February 9, 2011 by Ivy*

**physics**

Which one of the following situations are likely to involve turbulent flow? a 1 micrometer microbe swimming in water at 30 micrometers per second a 1 millimeter bug crawling on the windshield of a car that is travelling at 30 m/s a 10 micrometer blood cell moving through a ...
*April 10, 2014 by Turbulent Flow*

**statistics**

Q. The MBA department is concerned that dual degree students may be receiving lower grades than the regular MBA students. Two independent random samples have been selected. 100 observations from population 1 (dual degree students) and 100 from population 2 (MBA students). The ...
*November 29, 2010 by jeen*

**biology**

I'm doing a paper on a case study. The man, John Doe, is 55 years old, has high cholesterol, and has experienced frequent chest pains, profuse sweating, dizziness, and shallow breathing. These are the questions I have to answer: 1) What physiological response helped John ...
*January 25, 2011 by Anonymous*

**chem**

Benzaldehyde, C6H5CHO}, has a normal boiling point of 179.0 C and a critical point at 422 C and 45.9 atm. Using a phase diagram, estimate its vapor pressure at 125 Degrees (I'm putting this back up again. Since I still didn't understand it but the answer to it was 171 torr.)
*February 15, 2010 by joseph*

**physics**

If a 1-megaton nuclear weapon is exploded at ground level, the peak overpressure (that is, the pressure increase above normal atmo- spheric pressure) will be 0.2 atm at a distance of 6 km. What force due to such an explosion will be exerted on the side of a house with ...
*November 15, 2011 by Marti*

**statistics**

The distribution of scores on a standardized aptitude test is approximately normal with a mean of 490 and a standard deviation of 95. What is the minimum score needed to be in the top 25% on this test? Carry your intermediate computations to at least four decimal places, and ...
*May 6, 2012 by SHelia*

**statistics**

Random samples of size n=10 are taken from a normal population whose statndard deviation is known to be 5. Calculate the area under the sampling distribution curve for x bar between the points u-1 and u+1. That is find the probability that the sample mean lies within + or = 1 ...
*November 23, 2012 by joe*

**Statics**

In designing an experiment, a psychologist is willing to assume that the underlying distribution for the time to learn a list of words is approximately normal with a standard deviation of 40 seconds. He wants to be 95% sure that the maximum error of his estimate of the mean ...
*December 1, 2012 by Heather*

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