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March 27, 2015

Posts by Jennifer


Total # Posts: 2,086

math
Jane is taking a class and asks you to help her figure out what her last grade must be in the class to get a 85 in the class. She tells you the following calculation is used to find your final grade: w2d2 x is her last score which has not been taken. Explain this equation and ...
November 29, 2011

math - Please help me to understand
The average selling price of homes in a certain city is $356,300. Assume the variable is normally distributed with a standard deviation of $64,600. If 396 homes are for sale, how many homes will sell for more than $325,000? (Round up to the next whole number.) I don't ...
November 29, 2011

math - Please help me to understand
The average selling price of homes in a certain city is $356,300. Assume the variable is normally distributed with a standard deviation of $64,600. If 396 homes are for sale, how many homes will sell for more than $325,000? (Round up to the next whole number.) I don't ...
November 28, 2011

Intermediate algebra
Hello, I am kind stuck on this question In the lab you discover a relationship between the temperature of the air and the speed of sound. You find the speed of sound is never lower than 331 m/s and increases by 60% of the current temperature. a. What is the equation from this ...
November 28, 2011

math
Did I figure this right? score-mean is 356,300/64,600(SD)= 5.515 My book says that any z values beyond 3.25 us a=0.500. so I multiplied 0.500 by 396 = 198 I this correct?
November 28, 2011

math
The average selling price of homes in a certain city is $356,300. Assume the variable is normally distributed with a standard deviation of $64,600. If 396 homes are for sale, how many homes will sell for more than $325,000? (Round up to the next whole number.)
November 28, 2011

Statistics
Please someone help me to understand this. Here is what I figured and it is still wrong. x= 16.50-12.96= 3.54/4.46 (SD)= 0.79 the normal distribution for 0.79 is .285. I then multiplied that by 10,ooo and the answer is: 2,850. The correct answer is 2200 according to the answer...
November 28, 2011

statistics
If scores are normally distributed with a mean of 3.06 and a standard deviation of 0.84, what percent of the scores is: (a) greater than 3.9? (b) less than 2.22? (c) between 2.22 and 3.9?
November 28, 2011

statistics
If scores are normally distributed with a mean of 3.06 and a standard deviation of 0.84, what percent of the scores is: (a) greater than 3.9? (b) less than 2.22? (c) between 2.22 and 3.9?
November 28, 2011

chemistry
An experiment in your laboratory requires 500 mL of a .0200 M solution of Na2CO3. You are given solid Na2CO3, distilled water and a 500 mL volumetric flask Describe how to prepare the required solution showing all calculations and describing each step appropriately.
November 15, 2011

Chemistry
Please help me arrange these elements in decreasing order of metallic property. I, Mg, Al, Rb, Ca Thank You
November 14, 2011

physics
Since gauge pressure=p-p_0, you must add p_0 back to the gauge pressure and then multiply by the volume and then divide by atmospheric pressure.
November 13, 2011

Someone plz help me....i need help this is due now
A set of 50 data values has a mean of 27 and a variance of 16. I. Find the standard score (z) for a data value = 19. II. Find the probability of a data value < 19. III. Find the probability of a data value > 19.
November 12, 2011

Math....please help
A set of 50 data values has a mean of 27 and a variance of 16. I. Find the standard score (z) for a data value = 19. II. Find the probability of a data value < 19. III. Find the probability of a data value > 19.
November 12, 2011

Math
A set of 50 data values has a mean of 27 and a variance of 16. I. Find the standard score (z) for a data value = 19. II. Find the probability of a data value < 19. III. Find the probability of a data value > 19.
November 12, 2011

Math
Find the probability of a data value < 19.
November 12, 2011

MATH
Assume that the population of heights of male college students is approximately normally distributed with mean of 72.15 inches and standard deviation of 6.39 inches. A random sample of 96 heights is obtained. Show all work. (A) Find P (x > 73.25) (B) Find the mean and ...
November 11, 2011

MATH
Answer the following: (A) Find the binomial probability P(x = 4), where n = 12 and p = 0.30. (B) Set up, without solving, the binomial probability P(x is at most 4) using probability notation. (C) How would you find the normal approximation to the binomial probability P(x = 4...
November 11, 2011

MATH
A set of 50 data values has a mean of 27 and a variance of 16. I. Find the standard score (z) for a data value = 19. II. Find the probability of a data value < 19. III. Find the probability of a data value > 19.
November 11, 2011

MATH
sure what question?
November 11, 2011

MATH
Construct both an ungrouped and a grouped frequency distribution for the data given below: 207 211 204 208 202 203 211 202 205 212 210 212 204 199 204 201 213 200 204 207
November 11, 2011

MATH
An insecticide company exposes 10,000 cockroaches to its newest product, and exposes another 10,000 to their previous formula. The researchers use videotape to count how many cockroaches are still alive, and how many appear to be in distress, at 10 second intervals. When the ...
November 11, 2011

MATH
(A) Classify the following as an example of nominal, ordinal, interval, or ratio level of measurement, and state why it represents this level: zip codes for the state of Pennsylvania (B) Determine if this data is qualitative or quantitative: Nationality (C) In your own line of...
November 11, 2011

math
rectangular roof of hospital has width of 80ft, and area of 16,000sq ft. what is length and perimeter of roof
November 10, 2011

Math
For the table that follows, answer the following questions: x y 1 -8 2 -11 3 -14 4 - Would the correlation between x and y in the table above be positive or negative? - Find the missing value of y in the table. - How would the values of this table be interpreted in terms of ...
November 10, 2011

Math
Rank the following data in increasing order and find the positions and values of both the 39th percentile and 67th percentile. 5 9 9 0 7 2 5 6 9 1 0 6
November 10, 2011

Math
The following data lists the average monthly snowfall for January in 15 cities around the US: 42 45 8 18 45 15 31 46 3 33 2 6 32 47 36 Find the mean, variance, and standard deviation.
November 10, 2011

Math
Given the following frequency distribution, find the mean, variance, and standard deviation. Class Frequency 31-33 18 34-36 25 37-39 22 40-42 9 43-45 20
November 10, 2011

Math
Given the following frequency distribution, find the mean, variance, and standard deviation. Class Frequency 31-33 18 34-36 25
November 10, 2011

MATH...PLZ HELP
Given a level of confidence of 99% and a population standard deviation of 13, answer the following: (A) What other information is necessary to find the sample size (n)? (B) Find the Maximum Error of Estimate (E) if n = 61. Show all work.
November 6, 2011

Chemistry
If there is a radiation that has a half life of 10 days and we have it for 110 days, what will be the fraction of radiation left?
November 6, 2011

Physics
A ball player hits a home run, and the baseball just clears a wall 17.0 m high located 124.0 m from home plate. The ball is hit an an angle of 35° to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 1.0 m above the ground. (a) What is...
November 6, 2011

Adverbs and other parts of speech
which one of the following words phrases if the superlative form of an adjective? A.Less B.Slower C.Most active D.more rapidly
November 4, 2011

chemistry
Assume that you have 2.10 of the deadly gas hydrogen cyanide, . What is the volume of the gas at STP?
November 2, 2011

General Chemistry
c3h8+5o2 3co2+4h2o How many kg of propane only is in a 20lb tank?
October 30, 2011

Chemistry
I got that delta H=-24.4 and delta G=-24.3... But keep getting the equilibrium constant (K) wrong... Can someone please help...
October 30, 2011

Chemistry
a. Calculate the delta H, delta G, and equilibrium constant for the reaction of methane with Cl2 to give CH3Cl and HCl. Use the following information for your calculations: Bond Dissociation Energies: CH3-H (104.8kcal/mol), Cl-Cl(59.0 kcal/mol), CH3-Cl(85.0 kcal/mol), and H-Cl...
October 30, 2011

math
give the answer to two decimal places: 89 / 43 =
October 30, 2011

outline writing
I need help writing an outline for what I have written here. I would like to do my assignment of Microbes, more to the point on how microbes help us. When most people think of microbes they think for bad bacteria or the ugly side of what microbes does. I have been researching ...
October 30, 2011

Microbiology
I need help writing an outline for what I have written here. I would like to do my assignment of Microbes, more to the point on how microbes help us. When most people think of microbes they think for bad bacteria or the ugly side of what microbes does. I have been researching ...
October 30, 2011

Can u help me Ms. Sue...Stats
okay thank u
October 25, 2011

Can u help me Ms. Sue...Stats
oh...its okay...do u know who can help me? no one seems to be helping me :(
October 25, 2011

Can u help me Ms. Sue...Stats
In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side effect (B) at least three will have this mild...
October 25, 2011

Can u plz help me PsyDag?? Stats
In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side effect (B) at least three will have this mild...
October 25, 2011

Is this right?? Stats....
great i wasn't so sure about the last 2 thank you :)
October 25, 2011

Is this right?? Stats....
Classify the following as discrete or continuous random variables. (A) The time it takes to run a marathon (B) The number of fractions between 1 and 2 (C) A pair of dice is rolled, and the sum to appear on the dice is recorded (D) The length of a broad jump I got: (A) ...
October 25, 2011

Is this right?? Stats....
How many green elements are required to make this a legitimate probability distribution if there are a total of 50 elements in this sample? x red blue orange brown green P(x) 0.20 0.16 0.28 0.24 Would it be 0.12??
October 25, 2011

PLZ help!! Stats....
In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side effect (B) at least three will have this mild...
October 25, 2011

Stats
How many green elements are required to make this a legitimate probability distribution if there are a total of 50 elements in this sample? x red blue orange brown green P(x) 0.20 0.16 0.28 0.24 Would it be 0.11??
October 24, 2011

Stats
In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side effect (B) at least three will have this mild...
October 24, 2011

Stats
Classify the following as discrete or continuous random variables. (A) The time it takes to run a marathon (B) The number of fractions between 1 and 2 (C) A pair of dice is rolled, and the sum to appear on the dice is recorded (D) The length of a broad jump I got: (A) ...
October 24, 2011

Stats
A bag of colored blocks contains the following assortment of colors: red (18), blue (14), orange (20), purple (14), green (10), and yellow (4). Construct the probability distribution for x. I'm so lost....
October 24, 2011

PLZ HELP....STATS
You are given the following data. # of Absences Final Grade 0 96 1 92 2 71 3 66 4 60 5 51 A. Find the correlation coefficient for the data. B. Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.
October 23, 2011

NEED HELP PLZ!!! STATS
Three cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of tens drawn in a set of 3 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this experiment is completed...
October 23, 2011

Stats
USA snapshot presented a bar graph depicting business travelers’ impression of wait times in airport security lines over the past 12 months. Statistics were derived from Travel Industry Association of American Business Traveler Survey of 2034 respondents. Is this a ...
October 23, 2011

Stats
You are given the following data. # of Absences Final Grade 0 96 1 92 2 71 3 66 4 60 5 51 A. Find the correlation coefficient for the data. B. Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.
October 23, 2011

Stats
Three cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of tens drawn in a set of 3 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this experiment is completed...
October 23, 2011

Stats
Oh....I understand a little better now...thank you!
October 20, 2011

Stats
The linear correlation coefficient is a numerical value that ranges from -1.00 to +1.00. Describe in a sentence or two the meaning of each of these correlation coefficients: a) -1.00 b) +1.00
October 20, 2011

Statistics
So they are all probability distributions?
October 20, 2011

Statistics
USA snapshot presented a bar graph depicting business travelers’ impression of wait times in airport security lines over the past 12 months. Statistics were derived from Travel Industry Association of American Business Traveler Survey of 2034 respondents. Is this a ...
October 20, 2011

Statistics
The following data lists the average monthly snowfall for January in 15 cities around the US: 29 26 6 46 17 34 15 45 19 43 37 6 9 33 37 Find the mean, variance, and standard deviation.
October 17, 2011

Plz help me Sue!!
oh....so i get x = 53??
October 16, 2011

Plz help me Sue!!
Did i do that correctly??
October 16, 2011

Plz help me Sue!!
81 = (x + 352)/5 81 = 352x/5 81 = 70.4x x = 1.15??
October 16, 2011

Plz help me Sue!!
Starting with the data values 70 and 100, add three data values to the sample so that the mean is 81, the median is 91, and the mode is 91. How do i do this??
October 16, 2011

Statistics
Starting with the data values 70 and 100, add three data values to the sample so that the mean is 81, the median is 91, and the mode is 91. How do i do this??
October 16, 2011

Stats....plz help....
can u plz help me with the other problem i posted? i need help so bad! thank u!!
October 16, 2011

Stats....plz help....
ok thank u!!
October 16, 2011

Stats....plz help....
5.04? but how did u come up with multiplying it by 9? because it's the highest number?
October 16, 2011

Stats....plz help....
001136688999??
October 16, 2011

Stats....plz help....
Rank the following data in increasing order and find the position and value of the 56th percentile. Please show all of your work. 0 1 6 8 9 9 8 6 3 1 0 9 How do i find the position and value of the 56th percentile??
October 16, 2011

Math-confused...plz help
I. Use Chebyshev’s theorem to find what percent of the values will fall between 183 and 227 for a data set with a mean of 205 and standard deviation of 11. II. Use the Empirical Rule to find what two values 99.7% of the data will fall between for a data set with a mean of...
October 16, 2011

Please tell me if i did this correct
Given the following frequency distribution, find the mean, variance, and standard deviation. Please show all of your work. Errors Frequency 51-53 9 54-56 19 57-59 16 60-62 24 63-65 25 This is what I got: Mean = 59.19 Variance = 1.43 Standard Deviation = 2.05
October 16, 2011

Stats
still confused....
October 15, 2011

Stats
Start with x=75 and add four x values to make a smaple of five data such that the standard deviation of these data equals 0.
October 15, 2011

Stats
so the SD = 30??
October 15, 2011

Stats
V = 30^2 = 900??
October 15, 2011

Stats
A set of 50 data values has a mean of 15 and a variance of 36. Find the standard score of a data value = 30
October 15, 2011

Stats
001136688999?? How do I find the position and value of the 56th percentile?
October 15, 2011

Stats
Rank the following data in increasing order and find the position and value of the 56th percentile. Please show all of your work. 0 1 6 8 9 9 8 6 3 1 0 9
October 15, 2011

Stats
yay!! thank u!!
October 15, 2011

Stats
Z = 64-51/5.0 = 13/5.0 = 2.6 Z = 47-51/5.0 = -4/5.0 = -0.8 Is this correct?
October 15, 2011

Stats
A Math test has a mean of 51 and standard deviation of 5.0. Find the corresponding z scores for: I. a test score of 64 II. a test score of 47
October 15, 2011

Stats
okay so the first would be 0.75 correct? the second one would be 3 = -16.46 -3 = -16.46 is this correct?
October 15, 2011

Stats
1. Z = (s-205)/11 = 205/11 = 18.63??? This one confuses me 2. I have no idea how to do this.... Please help!!
October 15, 2011

Stats
I. Use Chebyshev’s theorem to find what percent of the values will fall between 183 and 227 for a data set with a mean of 205 and standard deviation of 11. II. Use the Empirical Rule to find what two values 99.7% of the data will fall between for a data set with a mean of...
October 15, 2011

Stats.....plz help me.....
Given the following frequency distribution, find the mean, variance, and standard deviation. Please show all of your work. Errors Frequency 51-53 9 54-56 19 57-59 16 60-62 24 63-65 25
October 14, 2011

Math
How are z scores and the "empirical rule" related?
October 13, 2011

Math Help
looks correct to me
October 13, 2011

Stats
Given the following frequency distribution, find the mean, variance, and standard deviation. Please show all of your work. Errors Frequency 51-53 9 54-56 19 57-59 16 60-62 24 63-65 25
October 13, 2011

Can someone help me please?
Statistics confuses me....thank you for your help :)
October 13, 2011

Can someone help me please?
A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 20
October 13, 2011

algebra
3/4 times 11/9 times 90 times 21/90
October 12, 2011

Help plz!! Math....
hmmmm....this is so confusing for me....
October 12, 2011

Help plz!! Math....
I apologize...thank you....so is it A data point of 20 is one standard deviation above the mean of 15, so the standard or "z" score is 1.0
October 12, 2011

misin ideas
regular aerobicise an individual more endurance tha show cause and effect
October 11, 2011

Chemistry
When a 5.50g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee cup calorimeter, the temperature of rises from 21.6 degrees C to 37.8 degrees C. Calculate Change of heat for the reaction in kJ (also in kJ/mol NaOH) for the solution process. Assume the ...
October 10, 2011

algebra
Find the length of the golden rectangle whose width is 14.72
October 9, 2011

Fibonacci numbers
I have been working on this question all day and can not figure out what to do. The question says according to the Quadratic Formula, the solutions of x^2-x-1=0 I know the positive solution is the golden rule ratio and the negative solution is the conjugate of 0(with a slash ...
October 9, 2011

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