Friday

July 25, 2014

July 25, 2014

Number of results: 30,868

**statistics**

what is the probability of 62 with a mean of 60 and a standard deviation of 7?
*July 19, 2010 by beverlt*

**statistics**

with a mean of 60 and standard deviation of 7, what is the z score at 1.64?
*May 25, 2011 by jackie*

**Math 110**

finding the standard deviation of 15, 20, 30, 35
*November 28, 2011 by April*

**statistics**

Suppose that, in fact, the blood cholesterol level of all men aged 20 to 34 follows the normal distribution with mean of u = 188 milligrams per deciliter (mg/dl) and standard deviation = 41 mg/dl. 1. Choose an SRS of 100 men from this population. What is the sampling ...
*February 4, 2013 by Zachovia*

**statistics**

Which is relatively better a score of 48 on psychology test or a score of 52 on an economics test, Scores on the psychology test have a mean of 87 and a standard deviation of 14. Scores on the economics test have a mean of 53 and a standard deviation of 8.
*October 27, 2013 by angela*

**Budgeting**

A quaint but well-established coffee shop, the Hot New Café, wants to build a new café for increased capacity. It’s expected sales are $800,000 for the first 5 years. Direct costs including labor and materials will be 50% of sales. Indirect costs are estimated at $100,000 a ...
*March 9, 2013 by Shannon*

**math help**

A survey was done recently by the Royal Bank with Ipsos Reid (reported in Globe and Mail Aug 16 2010) about financial issues that university students face. (Data used here is based on that survey, but randomized to be still within the margin of error of that survey.) The ...
*October 2, 2010 by jaz*

**stats**

A survey was done recently by the Royal Bank with Ipsos Reid (reported in Globe and Mail Aug 16 2010) about financial issues that university students face. (Data used here is based on that survey, but randomized to be still within the margin of error of that survey.) The ...
*October 2, 2010 by jaz*

**Another Math Statistical Question**

Assume Coca Bottling is a company producing power drinks. You visited the company and did a sampling of 15 bottles to figure out the average volume of the bottle. You recorded the following data: 17, 16, 17.5, 16.7, 17.3, 15, 17.2, 17, 17.2, 16.8, 17.3, 16.9, 17.4, 17.7, 17.1 ...
*May 12, 2008 by Johnny*

**College Stats**

A machine fills 64 ounce detergent jugs. It is known that the net amount of detergent poured into each jug has a normal distribution with a standard deviation of 0.35 ounces. The inspector wants to adjust the machine such that at least 95% of the jugs have more than 64 ounces ...
*October 28, 2008 by Riley*

**physics**

A ball was shot from the angles given in the table below. The corresponding ranges (landing at the same height from which it is shot) for three trials are given below as well. A. Determine the average range and standard deviation for each angle. B. Next calculate the initial ...
*October 20, 2010 by Meghan*

**Statistics**

The heights of the students in a statistics class are approximately normal with mean 68 inches and a standard deviation of 2.75 inches. Suppose that the heights of the 15 male students in the statistics class are also approximately normal with mean 71 inches. Would the ...
*January 15, 2011 by Alex*

**math**

No idea how to do this. I looked in my book and there usually is a data set present to get the first, second and third quartile. The lifetimes of lightbulbs of a particular type are normally distributed with a mean of 392 hours and a standard deviation of 9 hours. Find the ...
*April 22, 2007 by J*

**finance**

The required investment is $1 million, and anticipated year-end cash flows are as follows: Year 1 2 3 4 Cash flow $300,000 $400,000 $500,000 $200,000 Compute the net present value rate of return using a 10 percent required return. What should be decision rule in this example.
*January 16, 2012 by goshtaba*

**statistics**

once again I am not getting this. assume that the population of heights of male college students is normally distibuted with a mean of 69.09 and standard deviation of 4.71. A random sample of 92 heights is obtained. find the mean and standard error of the x distribution. find ...
*September 19, 2011 by denise*

**statistics**

A specific study found that the average number of doctor visits per year for people over 55 is 8 with a standard deviation of 2. Assume that the variable is normally distributed. 1. Identify the population mean. 2. Identify the population standard deviation. 3. Suppose a ...
*April 15, 2013 by Cam*

**statistics**

A machine is designed to fill jars with 16 ounces of coffee. A consumer suspects that the machine is not filling the jars completely. A sample of 8 jars has a mean of 15.6 ounces and a standard deviation of 0.3 ounce. Is there enough evidence to support the consumer's ...
*August 2, 2013 by ryan*

**Business Finance **

Neville Corporation, an amusement park, is considering a capital investment in a new exhibit. The exhibit would cost $174,777 and have an estimated useful life of 9 years. It will be sold for $69,200 at that time. (Amusement parks need to rotate exhibits to keep people ...
*July 3, 2012 by Francesca *

**statistics**

The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures students' study habits and attitudes toward school. Scores range from 0 to 200. The mean score for college students is about 115.8, and the standard deviation is about 32.9. A teacher ...
*March 1, 2011 by Yesenia*

**Statistics**

37% of all doctors are family practitioners. If there are 300 doctors in one city, what is the standard deviation for the number of family practitioners? What is the expected value for the number of family practitioners?
*September 24, 2010 by Lori*

**math**

You are the buyer for your university bookstore. One of the textbooks has a cost to you of $104 and you sell it to students for $208. In this case, however, you cannot salvage any value from copies that do not sell because a new edition is published every semester. Demand for ...
*July 17, 2012 by Candace*

**math**

a=16,00, r=11.5%, t=5 years determine the present value, p, you must invest to have the future value, a, at simple interest rate r after time t. round uo to nearest cent
*August 14, 2011 by marie *

**Math Help!**

A.) Determine "a" and "k" so both points are on the graph of the function. 1.) (0,1) (2,1); y=a(x-1)^2+k 2.) (1,11) (2,-19); y=a(x+1)^2+k B.) Determine whether or not the function f(x)=0.25(2x-15)^2+15 has a mazimum or a minimum value. Then find the value. C.) When y=2(x-3)(x+...
*January 21, 2014 by Lanie*

**math**

The probability that a person has immunity to a particular disease is 0.3. Find the mean and standard deviation for the random variable x, the number of people who have immunity in samples of size 28. This is a binomial distribution. mean= 28*.3 standard deviation= sqrt (28*.3...
*August 18, 2007 by manny*

**AP**

The composite scores of students on the ACT college entrance examination in a recent year had a Normal distribution with mean µ = 20.4 and standard deviation = 5.8. 1) What is the probability that a randomly chosen student scored 24 or higher on the ACT? 2) What are the mean ...
*February 2, 2011 by Erica L*

**statistics**

the following data represents the percentages of family income allocated to groceries for a sample of 50 shoppers: percentage of family income #of shoppers 10-19 6 20-29 14 30-39 16 40-49 11 50-59 3 1.calculate the value of mean 1.1 meadian percentage of family income spent on...
*April 27, 2007 by mary*

**Quantitative Research**

What is the probability of 59 if the mean is 60 and the standard deviation is 7?
*June 13, 2010 by Cecilia*

**stats**

Mean is 60 and standard deviation is 7. what percentage is 73 and below.
*October 12, 2010 by Christine*

**OMT101**

Find variance and standard deviation for the data 35,45,30,35,40,25
*March 28, 2011 by Yogesh*

**statistics**

a distribution has a mean of 5 and a standard deviation of 2, what is the z score of 8 ?
*February 26, 2011 by Ruben*

**statistics**

what is the variance and standard deviation for the group of numbers: 28 27 48 52 77 29 30 31 60
*March 4, 2011 by Barbara*

**hcc**

find sample variance and standard deviation.8,45,16,50,34,25,32,31,30,27.s^2=
*March 13, 2011 by chelsea*

**Total Quality Management**

Find the standard deviation of 32,15,54,18,and 46
*December 3, 2011 by Nelson*

**statistics**

a coin is tossed 16 times. What is the standard deviation?
*May 3, 2012 by Ambra*

**Statistics **

what drawback of the standard deviation is illustrated by example?
*June 28, 2012 by Lu*

**algebra2**

What are the mean, variance and standard deviation of these values? 62,41,54,60,49,58.
*April 8, 2013 by Lea*

**statistics**

what is the variance and standard deviation of the following numbers:14,16,26,36,12,16
*April 30, 2014 by Hunter*

**Math**

For a binomial distribution with n=20 trials and probability of success p=.05, we let r= number of successes out of 20 trials. Use the normal approximation to estimate P(6<=r<=12). How does this value compare with the corresponding probability obtained using the binomial...
*January 21, 2013 by Leanne*

**Statistics**

In hypothesis testing, if the population standard deviation is KNOWN, your graph should be labeled a T or Z line? In hypothesis testing, if the population standard deviation is NOT KNOWN, your graph should be labeled a T or Z line?
*October 21, 2009 by Kevin*

**economyst check!**

In many families both parents work, as a result there is increasing need for day care. Data was collected; and one year in Canada approximately 32% of children aged 0 to 11 years were in day care for at least 20h per week. What is the probability, in a random poll of 60 ...
*June 7, 2007 by stats!*

**math**

john has a loan but doesn't begin to repay his loan for 11 months, at a rate of $500 every month of four month. the interest rate is 8% compounded monthly determin the size of the loan using the following 2 steps 1. calculate the present value, pv1 of annuity payment at the ...
*August 9, 2012 by jule*

**statistics**

M&M plain candies have weights that are normally distrbuted with a mean weight of 0.8565 gram and a standard deviation of 0.0518 gram. A random sample of 100 M&M candies is obtained from a package containing 465 candies: the package label states that the net weight is 396.9 ...
*July 19, 2010 by cindy*

**statistics**

we want to if men and women perform differently on statistics tests. The average of 15 men's scores was 76. The average of 10 women's scores was 83. The standard deviation in both cases is 10. Test at 5% significance level. what is the null and alternate hypothese? is it a one...
*February 26, 2010 by Anonymous*

**finance**

A manufacturing company issues a bond with a 100,000 face value and a coupon rate of 7%. If the bond has a life of 30 years, pays annual coupons, and the yield to maturity is 6.8%, what percentage of the bond's price is the present value of the face value?
*September 6, 2012 by chris*

**Algebra 2**

a) The average height of sunflowers in a field is 64 inches with a standard deviation of 3.5 inches. Describe a normal curve for the distribution, including the values on the horizontal axis at one, two, and three standard deviations from the mean. b) If there are 3,000 plants...
*April 23, 2013 by Kelly*

**Algebra **

Question Part Points The diameter of an electric cable is normally distributed, with a mean of 0.6 inch and a standard deviation of 0.02 inch. What is the probability that the diameter will exceed 0.62 inch? (You may need to use the standard normal distribution table. Round ...
*June 15, 2013 by Grizz*

**statistics**

The diameter of an electric cable is normally distributed, with a mean of 0.8 inch and a standard deviation of 0.03 inch. What is the probability that the diameter will exceed 0.83 inch? (You may need to use the standard normal distribution table. Round your answer to three ...
*May 29, 2014 by Mary Ann *

**statistics**

On standard IQ tests, the mean is 120 and the standard deviation is 15. The results are very close to fitting a normal curve. Suppose an IQ test is given to a very large group of people. Find the percent of people whose IQ score is less than 120.
*February 16, 2012 by Anonymous*

**statistics**

Someone who has never seen a normal die before decides to estimate the mean value of all its faces (μ) by rolling it many times. First, they are told that the standard deviation is σ = 1.7. Then, they roll the die 50 times and get a sample mean of x-bar = 3.7. ...
*January 29, 2012 by Nadia*

**math**

the study hours are 4, 10, 20, 24, 34, 36, 42 and the z scores are 2.5, negative 1.75, negative .5, 0, 1.25, 1.5, 2.25 and the percentile ranks are 10,25,35,40,50,75,95 what is the study hour with a z score of 1.75, what is the standard deviation of all the students, and what ...
*December 20, 2010 by christina*

**Statistics**

A building contractor claims that they can renovate a 200 sq foot kitchen and dining room in 40 work hours plus minus 5 (the mean and standard deviation respectively). The work includes plumbing, electrical installation, cabinets, flooring, painting and installing new ...
*March 2, 2007 by Jason L*

**Statistics**

Kind attention Psydag: A random sample of size 20 from a normal population with sample mean 42 and sample standard deviation of 6 . To test the hypothesis the population mean 44 at 5% level of significance , find the p-value and comment Clarification: The sample size is 20 ...
*January 1, 2010 by Mrs. Lakshmi*

**statistics**

On a standard measure of hearing ability, the mean is 300 and the standard deviation is 20. Give the Z scores for persons who score (a) 340, (b) 310, and (c) 260. Give the raw scores for persons whose Z scores on this test are (d) 2.4, (e) 1.5, (f) 0, and (g) –4.5.
*June 29, 2009 by Gregory*

**statistics**

The respiratory rate per minute in newborns varies according to a distribution that is approximately Normal with mean 50 and standard deviation 5. The proportion of observations from a standard Normal distribution that take values less than 1.15 is about (a) 0.1251. (b) 0.8531...
*July 9, 2013 by Jen*

**statistic**

Chebyshev's thereon- the author's generac produces voltage amounts with a mean of 125.0 volts and a standard deviation of 0.3 volt. using chebyshev's theorem,what do we know about the percentage of voltage amounts that are within 3 standard deviations of the mean? What are the...
*September 18, 2011 by marie*

**statistics**

Given that x is a normally distributed random variable with a mean of 60 and a standard deviation of 10, find the P(56 < x <74). Please show all your work and write your answer in a complete sentence. Using the information from question 1, what percentage of the ...
*July 23, 2012 by Rachel*

**Math-Value of Mean**

A brewery has a beer dispensing machine that dispenses beer into the company's 12 ounce bottles. The distribution for the amount of beer dispensed by the machine follows a normal distribution with a standard deviation of 0.13 ounce. The company can control the mean amount of ...
*December 12, 2009 by Ashley*

**Finance**

I have a case study to do and I'm not sure how to go about it. I need to find the present value for three different offers, all of which have a 10% rate and ordinary annuities. This is the first offer: $1,000,000 now $200,000 each year for years 6 through and including year 15...
*October 11, 2011 by Justin*

**statistics**

5) The lifetime of a medical device s a normally distributed rv with standard deviation of 2 years. An experiment is conducted to test 15 medical devices and find their lifetimes to be: a. If the population mean is known to be 15 years, what is the probability that the mean ...
*December 8, 2012 by nur*

**STATS**

In a certain store, there is a .05 probability that the scanned price in the bar code scanner will not match the advertised price. The cashier scans 820 items. a) What is the expected number of mismatches and standard deviation? (Round your expected number of mismatches to 1 ...
*October 30, 2010 by Helen*

**AP Statistics - sampling distribution help**

The composite scores of students on the ACT college entrance examination in a recent year had a Normal distribution with mean µ = 20.4 and standard deviation = 5.8. 1) What is the probability that a randomly chosen student scored 24 or higher on the ACT? 2) What are the mean ...
*February 2, 2011 by Erica L*

**AP Statistics - Sampling Distribution Help**

The composite scores of students on the ACT college entrance examination in a recent year had a Normal distribution with mean µ = 20.4 and standard deviation = 5.8. 1) What is the probability that a randomly chosen student scored 24 or higher on the ACT? 2) What are the mean ...
*February 3, 2011 by Erica L*

**Chemistry**

C2H2(g) + 2 H2(g)--> C2H6(g) Substance So (J/mol∙K) ∆Hºf (kJ/mol) C2H2(g 200.9 226.7 H2(g) 130.7 0 C2H6(g) -- -84.7 Bond Bond Energy (kJ/mol) C-C 347 C=C 611 C-H 414 H-H 436 If the value of the standard entropy change, ∆Sº for the reaction is -232.7 ...
*January 11, 2011 by Brenda*

**Chemistry**

C2H2(g) + 2 H2(g)--> C2H6(g) Substance So (J/mol∙K) ∆Hºf (kJ/mol) C2H2(g 200.9 226.7 H2(g) 130.7 0 C2H6(g) -- -84.7 Bond Bond Energy (kJ/mol) C-C 347 C=C 611 C-H 414 H-H 436 If the value of the standard entropy change, ∆Sº for the reaction is -232.7 ...
*January 12, 2011 by Brenda*

**chemistry**

C2H2(g) + 2 H2(g)--> C2H6(g) Substance So (J/mol∙K) ∆Hºf (kJ/mol) C2H2(g 200.9 226.7 H2(g) 130.7 0 C2H6(g) -- -84.7 Bond Bond Energy (kJ/mol) C-C 347 C=C 611 C-H 414 H-H 436 If the value of the standard entropy change, ∆Sº for the reaction is -232.7 ...
*January 13, 2011 by Brenda*

**Statistics**

Calculate the Standard Deviation of the following list of data: 6, 7, 8, 9, 10
*May 10, 2008 by Shannon*

**Math**

I need to know the standard deviation and how to get it for the following set of numbers. {10, 11, 10, 12, 11, 10, 11, 11, 12, 13, 11, 10, 14}
*January 9, 2010 by Anna*

**statistics**

if the mean of a set of data is 23.00, and 12.60 has a z-score of -1.30, then what is the standard deviation?
*March 10, 2010 by Anonymous*

**Statistics**

Find the population standard deviation for the data set? 1, 2, 3, 5, 6, 7
*May 14, 2011 by Phillip*

**Statistics**

The mean of a data set is 23 and 12.6. The z-score is -1.30. What is the standard deviation?
*June 26, 2011 by Shelle*

**statistics**

how to interpret two diffrent mean and standard deviation ??????????????
*November 24, 2011 by metu*

**Statistics**

can someone give me the formula of standard deviation?Please! Thanks!
*February 25, 2012 by pallavi*

**Stastistic**

Finde the mean , variance , standard deviation N-127, P=0.66
*August 6, 2012 by David*

**statistics**

if the mean=100 and the standard deviation=8, calculate p(x>108)
*September 11, 2012 by katie*

**statistics**

standard deviation is not resistant to outliers true or false?
*September 18, 2012 by Gee*

**stats**

if you know the mean and standard deviation, how do you determine the proportion that will and will not be included
*November 4, 2012 by mary*

**statistics**

What is the standard deviation of 31 sample values with a mean of 2954?
*February 22, 2013 by glenzy*

**rutgers**

how do you get a standard deviation of 1.04563 when the sum of x=238, n=25 and the mean is 9.52
*February 22, 2014 by tangela*

**Statistics**

If I don't know the mean and the standard deviation how can I find the area of z-score -0.75
*March 8, 2014 by LaToya*

**Statistics**

If I don't know the mean and the standard deviation how can I find the area of z-score -0.75
*March 8, 2014 by LaToya*

**Algebra**

The mean is 18.1 The z-score for 13.0 is - 1.7. What is the standard deviation for this data set.
*May 19, 2014 by Nicole*

**statistics**

a random sample of 80 college students was selected to participate in a experiment. the mean of the sample is 317 points, the standard deviation of 37 there are 310 students that didn't complete the experiment 1. compute the appropriate test statistic? 2. what is the critical ...
*July 11, 2012 by Anonymous*

**business**

Computation of Present Value) Using the appropriate interest table, compute the present values of the following periodic amounts due at the end of the designated periods. $30,000 payable at the end of the seventh, eighth, ninth, and tenth periods at 12%.
*November 21, 2009 by Dale*

**statistics**

The time that it takes a randomly selected job applicant to perform a certain task has a distribution that can be approximated by a normal distribution with a mean value of 120 sec and a standard deviation of 25 sec. The fastest 10% are to be given advanced training. What task...
*April 8, 2011 by chels*

**Stats**

The time that it takes a randomly selected job applicant to perform a certain task has a distribution that can be approximated by a normal distribution with a mean value of 150 sec and a standard deviation of 20 sec. The fastest 10% are to be given advanced training. What task...
*October 2, 2013 by B*

**finance**

Use the following scenario to answer Discussion Question 2. Jean will receive $8,500 per year for the next 15 years from her trust. If a 7% interest rate is applied, what is the current value of the future payments? Describe how you solved this problem, including which table (...
*September 17, 2009 by Anonymous*

**statistics**

A consumer magazine has contacted a simple random sample of 33 owners of a certain model of automobile and asked each owner how many defects had to be corrected with in the first 2 months of ownership. The average number of defects was x with (with line over the x)=3.7, with a...
*October 15, 2009 by Tammy*

**Data Management **

Emilio has played ten rounds of golf this season. His mean score is 80 and standard deviation is 4. Assume Emilio's golf scores are normally distributed. a) Find the 95% confidence interval of Emilio's mean golf score b)Find the 95% confidence interval of Emilio's mean golf ...
*May 14, 2014 by Caroline*

**Statistics**

Lead (Pb) concentrations were measured in waterfowl eggshell samples from two locations. In n1 = 41 samples from a location downstream from a paper mill, the mean Pb concentration was 1 x = 0.13 ppm with a standard deviation of s1 = 0.04 ppm. In n2 = 31 samples from a location...
*November 7, 2012 by Erik*

**Statistics**

Lead (Pb) concentrations were measured in waterfowl eggshell samples from two locations. In n1 = 41 samples from a location downstream from a paper mill, the mean Pb concentration was 1 x = 0.13 ppm with a standard deviation of s1 = 0.04 ppm. In n2 = 31 samples from a location...
*November 7, 2012 by Erik*

**math**

A person’s blood glucose level and diabetesare closely related. Let x be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. After a 12-hour fast, the random variable x will have a distribution that is approximately normal with mean &#...
*November 29, 2010 by Kris*

**Chemistry**

Health regulations stipulate that the amount of arsenate in drinking water be no grater than 10 parts per billion (ppb) arsenic. If the arsenic present is arsenate, AsO4^-3, what mass of sodium arsenate would be present in a 1.00 L sample of drinking water that just meets the ...
*December 11, 2012 by Sandy*

**econ**

National Accounting (the value of GDP should be the same all along the exercice) Say that PmQ = 20 (market value of domestic production), J = 5 (imports), FC = 8.5 (total final consumption), IC = 4 (intermediate consumption), IT = 4 (total investment), Δinventories = 2.5...
*September 11, 2007 by AJ Kerin*

**Pre-calculus**

A set of data is normally distributed with a mean of 500 and standard deviation of 40. a). What percent of the data is between 460 and 540? P(460<x<540)=P(-1<z<1) =0.8413-0.1587 =0.6826 b). Find the probabilty that a value selected at random is less than 420. P(x&...
*January 16, 2009 by Mary*

**statistics**

According to the local real estate board, the average number of days that homes stay on the market before selling is 78.4 with a standard deviation equal to 11 days. A prospective seller selected a random sample of 36 homes from the multiple listing service. Above what value ...
*July 6, 2013 by Anonymous*

**Statistics**

An organization is studying whether women have caught up to men in starting pay after attending college. They randomly sampled 28 women, who earned an average of $38,293.78 out of college with a standard deviation of $5,170.22. Twenty-four men were also randomly sampled, and ...
*June 18, 2012 by Mike*

**statistics**

A researcher wishes to estimate the mean height of women aged between 60 and 65 in the US. She desires a margin of error of 0.2 inches. Past studies suggest that a population standard deviation deviation of 3.2 inches is reasonable. Estimate the minimum sample size needed to ...
*January 23, 2012 by dan*

**AP Physics B**

can you check my reasoning 1. The problem statement, all variables and given/known data ok well then... we did a lab were you have a hanging mass attached to a stirng that went through a straw and was attached to a rubber stopper. The lab was to find the mass of the rubber ...
*September 13, 2009 by AP Physics B*

**MATH**

A person scores 81 on a test of verbal ability and 6.4 on a test of quantitative ability. For the verbal ability test, the mean for people in general is 50 and the standard deviation is 20. For the quantitative ability, the mean for people in general is 0 and the standard ...
*September 9, 2013 by Jaky*

**statistics**

The scores of students on the ACT college entrance examination in a recent year had a normal distribution with a mean of 18.6 and a standard deviation of 5.9. A simple random sample of 50 students who took the exam is selected for study: A) What is the shape, mean, and ...
*November 6, 2008 by Marshall*

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