1. statistics

    The weight of a can made from a machine is normally distributed with a mean of 25 grams and a standard deviation of 0.4 grams. What percentage of the cans from this machine would not meet the minimum required weight of 24 grams? Round to the nearest
  2. math

    The weight of a can made from a machine is normally distributed with a mean of 25 grams and a standard deviation of 0.4 grams. What percentage of the cans from this machine would not meet the minimum required weight of 24 grams? Round to the nearest
  3. math

    in 1996 there were about 2,342,000 marriages in the united states, using the # above my teacher wants me to find percentage of marriages per month she started me with january which had 100,000 mariages which came out to 4 percent of marriages for that
  4. Chemistry

    I'm a bit confused as to when I should use an alpha particle and when to use a beta particle in a nuclear equation. For instance, the nuclear equation for carbon-14 is nitrogen-14 and a beta particle. Could I also say the equation is Berylium-13 and an
  5. chemistry

    Ammonium chloride and sodium nitrite react to form sodium chloride, water and nitrogen gas. If 6.33 moles of ammonium chloride react with sodium nitrite, how many grams of sodium chloride will be produced?
  6. Chemistry

    18) Aspirin is a monoprotic acid called acetylsalicylic acid. Its formula is HC9H7O4. A certain pain reliever was analyzed for aspirin by dissolving 0.534 g of it in water and titrating it with 0.0446 M KOH solution. The titration required 26.73 mL of
  7. chemistry

    Aspirin is a monoprotic acid called acetylsalicylic acid. Its formula is HC9H7O4. A certain pain reliever was analyzed for aspirin by dissolving 0.311 g of it in water and titrating it with 0.0398 M KOH solution. The titration required 22.32 mL of base.
  8. Chemistry

    Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of Helium is present in a helium-oxygen mixture having a density of 0.538 g/L at 25 degrees C and 721 mmHg?
  9. math

    in 2001 there were about 2,317,000 marriages in the United States. Ms.Sue, I know you want me to do this by myself and you would do the explaining. Ms.Sue here is one of the example problems from my study links.I don't get how they find the percentage. My
  10. College Chem

    Impure sample of table salt that weighed 0.8421g, when dissolved in water and treated with excess AgNO3, formed 2.044g of AgCl. What is the percentage of NaCl in the impure sample? Do I need the molecular weight to start this equation? Where do I start?
  11. Chemistry

    My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the
  12. Chemistry

    My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the
  13. physics

    A 25 g bullet traveling at 280 m/s passes completely through a wooden block, initially at rest on a smooth table. The block has a mass of 1000 g. The bullet emerges traveling in the same direction, but at 50 m/s. What percentage of total kinetic energy is
  14. Chemistry

    The chemical reaction of 100 g of salicylic acid, C7H6O3, with excess acetic anhydride produces 50.0 g of aspirin, C9H8O4, according to the equation. What is the percentage yield for the reaction shown below? Please show your work.
  15. 12th grade chemistry

    A piece of iron wire weighs 2.225g. It is dissolved in acid, which oxidizes the iron to iron(II), and made up to 250 mL. A 25mL sample required 31.0 mL of a 0.0185mol/L solution of potassium dichromate. Calculate the percentage of iron in the wire.
  16. Chemistry

    My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the
  17. difficult chemistry

    502g sample of dry cac03 and cacl2 mixture was dissolved in 25ml of 0.925 M HCL solution. What was cacl2 percentage in original sample if 22ml of 0.09312 m NAOH was used to titrated excess HCL? The answer 29.89% Who helps me
  18. Chemistry

    The chemical reaction of 100 g of salicylic acid, C7H6O3, with excess acetic anhydride produces 50.0 g of aspirin, C9H8O4, according to the equation. What is the percentage yield for the reaction shown below? Please show your work. C7H6O3 + C4H6O3 →
  19. math

    At Sunnyside Place, as of March 31, a total of 12 residents have moved out. What is your property’s annualized turnover percentage rate? Note: this is connected to the first Sunnyside Place apartment question, which total apartments are 100 Again, thank
  20. accounting

    Hi! I can't figure out this question...any help is greatly appreciated! In a common size financial statement, which of the following is given a percentage of 100 percent? a. total liabilities b. total assets c. net income d. cost of goods sold I was
  21. Physics

    A solar cell with dimensions 12cm x 12cm is illuminated at standard test conditions. The cell presents the following external parameters: Voc=0.8V,Isc=3A,Vmp=0.75V,Imp=2.5A Calculate the fill factor in percentage [%]: Calculate the efficiency (in %):
  22. chemistry

    The antacid in question (with an active ingredient of Ca(HCO3)2), upon treatment with excess hydrochloric acid, a 0.413 g sample gives 92.85 mL of CO2 at 25.00oC and 1.000 atm. What percentage of the antacid is active ingredient? Assume a perfect system
  23. Science, please help!

    Please check my answer! Fill in the blank for below: Resources that cannot be replaced in the environment once they are used are _____. renewable resources compost nonrenewable resources I think the answer is nonrenewable resources.I might be incorrect, so
  24. Math: percentage problem

    A set of building blocks includes squares of various shapes and colors. If 20% of the blockers were square and 50% of the squares block are red, then ___ of the blocks are red squares. My answer is 40% (20% x 50% / 100% = 40%). Is this correct?
  25. statistics

    Distance travelled in a week by sales staff employed by nationwide security firm is approximately normally distributed with a mean of miles and standard deviation of 48 miles. Estimate the percentage of staff who in a week travel less than 80 miles
  26. dzwaboni sec school and am doing this subject(math literacy, history, geography,life science, life orientation, English and tshivenda

    Am in grade 10 and I do maths literacy.so what percentage should I get in maths literacy to do law degree?
  27. math

    The heights of American women between the ages of 18 and 24 are approximately normally distributed. The mean is 64.1 inches, and the standard deviation is 2.5 inches. What percentage of such women are over 5 feet 8 inches tall? z = (68 - 64.1)/2.5 = + 1.56
  28. Chemistry

    A 0.446-gram sample of iron ore is dissolved in HCl and the iron (Fe solid) is reduced to Fe2+. The solution is then titrated by 38.6mL of 0.105 N KMn)4. Calculate the percentage of Fe in the iron ore sample.
  29. finance math

    A car dealer purchased 2 cars, one for $1500 and the other for $20000, He then sold the first car at a loss of 14% and the second car for a profit of 15%. Find the dealer¡¯s profit for the whole transaction and express the answer as a percentage of his
  30. Chemistry+Empirical formula

    This is kind of tricky for me. What os the empirical formula (lowest whole number ratio) of the compounds below? A. 25.3% Cu, 12.9% S, 25.7% O, 36.1% water How would i set this up? The water at the end is confusing me. I think I need to find the percentage
  31. math

    1. kristi jogged for 3/5 of an hr,swam 1/2 of an hr, rode her bike 3/4 of an hr how long did she exercise?=1 7/20 2.the intersest rate on an equity line of credit was 7 7/8% last month this month the interset rate is 10 3/2% how many percentage points has
  32. Math

    Austin bought a new house. The value of his house is modeled by the function H\left( x \right) = 120000{\left( {1.20} \right)^{\left( {\frac{1}{2}x} \right)}} where x is the number of years since he purchased the house. Looking at the model by what
  33. math

    If a pyramid is sliced by a plane parallel to the base of the pyramid and that plane bisects the altitude of the pyramid, what percentage of the volume of the pyramid lies below the slicing plane?
  34. Strayer Math

    Latoya ran for president of the chess club, and she received 18 votes. There were 40 members in the club. What percentage of the club members voted for Latoya?
  35. chemistry

    The label of a spread says that it contains, per 100 g product: 80 g fat; 20 g saturated fat. What is the percentage of saturated fatty acids expected in the fat extracted from this spread? 25% 80% none of these 20% 16%
  36. Statistics

    The ages of commercial aircraft are normally distributed with a mean of 13.5 years and a standard deviation of 7.3 years. What percentage of individual aircraft have ages greater than 15 ​years?
  37. science

    Ethanol can also be manufactured from glucose, C6H12O6. C6H12O6 2CO2 + 2C2H5OH. A solution containing 18 kg of glucose makes only 0.92 kg of ethanol. Calculate the percentage yield of ethanol.
  38. maths

    A farmer bought 3 1/2 dozen eggs. Fourteen were bad. a) what fraction were bad? b) What percentage were good? c) If the eggs cost $18.00 per dozen. How much did he pay for the eggs?
  39. MATH214

    A tennis ball can in the shape of a cylinder holds three tennis balls snugly. If the radius of a tennis ball is 3.5 cm, what percentage of the tennis ball can is occupied by air?
  40. chem

    a compound containing only boron, nitrogen and hydrogen was found to be 40.3% B, 52.2%N, and 7.5% H by mass. If 3.301g of this compound is dissolved in 50.00g of benzene, the solution produced freezes at 1.30 degrees celsius. If Kf(freezing point
  41. Chemistry

    What volume of hydrogen is necessary to react with five liters of nitrogen to produce ammonia? (assume constant temprature and pressure) Balanced equation- N2 + 3H2= 2NH3 After finding this answer, what volum of ammonia is produced in this reaction? 1.
  42. Math

    Please help me with these problems. Decimals and fractions Construction: an a-frame cabin has a triangular front with a base of 30 ft and a height of 20 ft. If the front is to be glass that cost $3 per square foot, what will the glass cost? The distance
  43. Chemistry (check)

    Are the following names correct? CN- cyanide ion H2O dihydrogen monoxide ClO2 chlorite ClO4- perchlorate N2O dinitrogen monoxide GeF4 germanium tetrafluoride SO32- sulfite IF3 iodine trifluoride PO33- phosphite NH3 nitrogen dihydrogen ICl3 iodine
  44. general science

    2 waves are traveling through a container of nitrogen gas. Amplitude of the first wave is 0.3 cm, and the second 0.9 cm. What is true about the two waves? a. the energy of thee first wave is less than the second b. energy of the first wave is greater c.
  45. math

    Miniature cactuses usually cost £25 but have a sale price of £20. what is the percentage decrease in the price of miniature cactuses?
  46. chemistry

    Copper (II) fluoride contains 37.42% {\rm F} by mass. Use this percentage to calculate the mass of fluorine (in {\rm g}) contained in 56.0{\rm g} of copper (II) fluoride
  47. Chemistry

    Ammonium nitrate is an oxidizing agent and can give rise to explosive mixtures of mixture of two moles of powdered aluminum and 3 moles of ammonium nitrate crystals react exothermically yielding nitrogen gas water vapor and aluminum oxide how many grams of
  48. Chemistry

    Trichloroethane, C2H3Cl3, is the active ingredient in aerosols that claim to stain-proof men's ties. Trichloroethane has a vapor pressure of 100.0 mm Hg at 20.0 C and boils at 74.1 C. An uncovered cup (1/2 pint) of trichloroethane (d=1.325 g/mL) is kept in
  49. finance

    A speculator sells a stock short for $55 a share. The company pays a $2 annual cash dividend. After a year has passed, the seller covers the short position at $45. What is the percentage return on the position (excluding the impact of any interest expense
  50. Finance

    A speculator sells a stock short for $70 a share. The company pays a $2 annual cash dividend. After a year has passed, the seller covers the short position at $60. What is the percentage return on the position (excluding the impact of any interest expense
  51. English

    what is the complete subject and complete predicate on the following sentances 1. Angela's favorite program changes the colors and sixes of images. 2. Graphic artists can choose a percentage of red, blue or yellow. 3. They can also focus a photograph, or
  52. Accounting

    Which of the following would be most likely to lead to a higher level of interest rates in the economy? Answer a. Corporations step up their expansion plans and thus increase their demand for capital. b. Households start saving a larger percentage of their
  53. Moles

    i was practicing some advanced level questions and i came across this one On heating with soda lime, sodium ethanoate decomposes in accordance with the following eqn CH3COONa + NaOH ----> CH4 + Na2CO3 iF 8.2g of sodium ethanoate produced 560 cm^3 of
  54. Accounting

    Which of the following would be most likely to lead to a higher level of interest rates in the economy? Answer a. Corporations step up their expansion plans and thus increase their demand for capital. b. Households start saving a larger percentage of their
  55. 11th grade chemistry

    The bottled butane gas is installed in an oven that can supply 0.125 g/hr .In a kitchen room of volume 32 m^3 (volume of air), the oven is made to operate for 2 hours. Assuming the kitchen room is closed, what is the mole composition of the atmosphere in
  56. Chemistry

    12.976 g of lead combines with 2.004 g of oxygen to form PbO2 . PbO2 can also be produced by heating lead nitrate and it was found that the percentage of oxygen present in PbO2 is 13.38%. With the help of given information,illustrate the law of constant
  57. chem!

    Arrange the three metals(Cu, Zn, and Mg) in order of their relative strengths as reducing agents, placing the strongest first. Arrange the three metallic ions ( Cu(No3)2, Zn(No3)2, and Mg(No3)2 ) in order of their relative strengths as oxidizing agents,
  58. Chem

    Arrange the three metals(Cu, Zn, and Mg) in order of their relative strengths as reducing agents, placing the strongest first. Arrange the three metallic ions ( Cu(No3)2, Zn(No3)2, and Mg(No3)2 ) in order of their relative strengths as oxidizing agents,
  59. Pre Algebra

    Carol has a collection of 100 stamps. The graph shows the percentage of stamps she has from each country. How many more of Carol stamps are from Italy then from England. A. 22 stamps B. 25 stamps C. 47 stamps D. 3 stamps Please help me I'm a little bit
  60. Chemistry

    A solid sample containing a simple mixture of NaHSO3 and Na2SO3 was dissolved in distilled water and titrated with a standard HCl solution. 13.88 mL was required to reach the first stoichiometric point, and an additional 45.12 mL to reach the second. What
  61. precalc

    Without further study, you forget things as time passes. A model of human memory gives the percentage, p, of acquired knowledge that a person retains after t weeks. The formula is p = (100 – a)e-bt + a, where a and b vary from one person to another. If a
  62. hi ms.sue

    About what percentage of southeast asian countries are islands? A)50% B)10% C)70% D)80% my choice is a. early cultures devolped in southeast asia through: A)extensive marititme trade B)isolated pockets of ethnic devolpment C)contact with europeans traders
  63. Chemistry

    Use oxidation numbers to identify if this reaction is REDOX reactions. 3NO2(g) + H2O(l) �� 2HNO3(aq) + NO(g) 3NO2 = -3 for N = -2 for o2 H2O = +1 for H2 = -2 for O ----> 2HNO3 = +1 for 2H = -3 for N = -2 for O3 NO = -3 for N = -2 for O
  64. Chemistry honors

    Formula: 2LiOH + CO2 yields Li2CO3 +H2O Suppose a lithium hydroxide canister contains 155grams of LiOH. What mass of CO2 will the cannister be able to absorb? If it is found that after 24 hours of use the cannister has absorbed 102 grams of CO2. What
  65. math

    Tammy has 60 markers. 15 of the markers are blue. What percentage of her markers are blue? To make 0.25 a percent, how many decimal places do you move the decimal point?
  66. math

    Dominoes pizza offers 30 different types of pizza and 9 of them contain pepperoni. what percentage of their total number of pizza types have pepperoni on it? Can someone explain to me the procedure please
  67. math

    james works an average of 22 hours per week with a standard deviation of 3.5 hours. what percentage of the time does james work more than 31 hours per week?
  68. chemistry.

    Which hydrocarbon pair below have identical mass percentage of C? A: C3H4 and C3H6 B: C2H4 and C3H4 C: C2H4 and C4H2 D: C2H4 and C3H6 E: None of the above My answer is E...Can any one help me?
  69. chemistry

    if 8.99g of scandium and 8.99g of oxgen react to give scandium oxide and a leftover 3.56g.what percentage of scandium oxide is the oxygen
  70. math

    What is the interest on $600 for 5 years is $210.What is the percentage rate? 600 x rate x 5 yrs = 210. Solve for rate, then multiply by 100.
  71. math

    A class of students had a test. If each boy had got 3 points more for the test, then the average result of the class would had been 1,2 points higher. What percentage of the class are girls?
  72. Chemistry

    You start with 2.5L of a KNO3 stock solution and wish to prepare 10.0 L of 1.5 M KNO3. What percentage (m/v) would the potassium nitrate stock solution need to be if you were to use it all? (MW of KNO3: 101g/mole)
  73. math

    what percent of 25 is 10? please explain how to get the answer. 40% well how do uget the answer? i need to know okay say what percent of 25 is 10 you do 10 divided by 25 and it gives you the percentage of .4 which is 40% move the decimal over two places
  74. Quick chemistry check

    Please check each of these mole statements. Correct me if I'm wrong! 1. 59g of hydrochloric acid (HCL)=____moles I got 1.6 moles 2. 4.6 moles of sodium hydroxide (NaOH)=___ grams I got 184 grams 3. 35.0 of sulfuric acid (H2SO4)=__ f.u sulfuric acid I got
  75. Chemistry

    In the Haber-Bosch process, nitrogen and hydrogen gas are reacted under high temperature 500 degrees C and pressure 200 atm to form ammonia gas (NH3) according to the following equation: N2+3H2 = 2NH3 If 9300 L H2 gas is reacted with an excess of N2 gas at
  76. Physics

    The center of a 1.50 diameter spherical pocket of oil is 1.20 beneath the Earth's surface. Estimate by what percentage directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is 800 kg/m^3.
  77. Physics

    The center of a 1.50 diameter spherical pocket of oil is 1.20 beneath the Earth's surface. Estimate by what percentage directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is 800 kg/m^3.
  78. Physics Problem 6.20

    The center of a 1.10 diameter spherical pocket of oil is 1.10 beneath the Earth's surface. Estimate by what percentage directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is
  79. finance

    8. Calculate the return on investment in dollars and as a percentage for an investment that you purchase for $500 and sell for $600. (2.0 points) TIP: If you don't remember how to calculate return on investment, review the Calculating ROI pages in Section
  80. computer graphics

    A pie chart needs to be drawn to show the percentage of total marks obtained by students. suppose 8%of studentss got 90% and above ; 52% got 75%to805 ; and 30% got 60% to 75%and remaing otained below 60%mark. no one failed .write an algorithm to drraw the
  81. Chemistry

    1.what is the type of radiation (alpha,beta, or gamma) is represented by each of the following. A)the most penetrating type of radiation is B) When this particle is emitted an atom of carbon (atomic number 6) will change to an atom of nitrogen (atomic
  82. AP Chemistry

    1.A compound consists of 65.45% C, 5.492% H, and 29.06% O on a mass basis and has a molecular mass of 110 g/mol. Determine the molecular formula of the compound. 2. What is the formula weight of iron (II) sulfate? Answer in units of g/mol. 3. What is the %
  83. Science-Chemistry

    1.)A sample of oxygen took 55 seconds to travel a certain distance. How long would it take for the same number of moles of nitrogen to travel the same distance. 2.) A sample of hydrogen gas traveled 45m in a given amount of time. An unknown gas traveled
  84. CHEMISTRY: URGENT

    30cm^3 of a mixture of methane and ethane were mixed with 100cm^3 of oxygen at ordinary temperature and pressure and exploded. After cooling the residual gases occupied 61.5cm^3. Find the percentage by volume of each gas in the mixture, methane (CH4) and
  85. Math - Probability

    19. On the 24th of December for the past 10 years it has snowed eight times. What is the chance for snow this next December 24? 20. Congressman X is up for his 6th term. Thus far in five elections he has won by 58,56,62,70, and 54 percent. On this basis of
  86. College-Business Investments

    An investor bought 100 shares of Copier Corp. for $65 a share. The firm paid an annual dividend of $2 a share. Commissions were $75 to purchase and $75 to sell. The price of the stock rose to $100 and the investor sold. What is the percentage earned on the
  87. Maths

    From experience, Mr Subbu has found that the low bid on a construction job can be regarded as a random variable having the uniform density f(x)= 0.75C 2C/3 <X< 2C = 0 otherwise Where C is his own estimate of the cost of the job. What percentage
  88. Investments

    P4.3 Assuming you purchased a share of stock for $50 one year ago, sold it today for $60, and during the year received three dividend payments totaling $2.70, calculated the following: (a) Income (b) Capital Gain (or loss) (c) Total Return in Dollars (d)
  89. Math

    The weights of all one hundred (100) 9th graders at a school are measured, and it is found that the mean of all the measurements is 100 lbs., with a standard deviation of 15 lbs.   Explain how you would use this information to determine the percentage of
  90. statistics

    There were 50 men and 50 women who were randomly selected from a larger population. •A t-test was conducted to compare men and women’s performance on an assessment after eating chocolate. The results showed an independent t-test value of t .05(99) =
  91. US history HELP

    Which of the following statements about the Social Security Act is NOT true? 1. It was based on a progressive tax that took a larger percentage of higher incomes. 2. It provided old-age pensions. 3. It was, according to Roosevelt, the “supreme
  92. US history

    Which of the following statements about the Social Security Act is NOT true? 1. It was based on a progressive tax that took a larger percentage of higher incomes. 2. It provided old-age pensions. 3. It was, according to Roosevelt, the “supreme
  93. Financial

    Suppose a Midwest Telephone and Telegraph (MTT) Company bond, maturing in 1 year, can be purchased today for $975. Assuming that the bond is held until maturity, the investor will receive $1,000 (principal) plus 6 percent interest (that is, 0.06 3 $1,000 5
  94. Statistics

    Let x be the elevation (in thousands of feet) for an archaeological site in the southwestern United States. Let y be the percentage of unidentified artifacts (no specific cultural affiliation) at a given elevation. Suppose that the following data were
  95. Finance

    Suppose a Midwest Telephone and Telegraph (MTT) Company bond, maturing in 1 year, can be purchased today for $975. Assuming that the bond is held until maturity, the investor will receive $1,000 (principal) plus 6 percent interest (that is, 0.06 3 $1,000 5
  96. math214

    I have no clue how to answer this question. A farmer has a square plot of land. An irrigation system can be installed with the option of one large circular sprinkler, or nine small sprinklers. The farmer wants to know which plan will provide water to the
  97. Statistics

    Let x be the elevation (in thousands of feet) for an archaeological site in the southwestern United States. Let y be the percentage of unidentified artifacts (no specific cultural affiliation) at a given elevation. Suppose that the following data were
  98. FINANCE

    Suppose a Midwest Telephone and Telegraph (MTT) Company bond, maturing in 1 year, can be purchased today for $975. Assuming that the bond is held until maturity, the investor will receive $1,000 (principal) plus 6 percent interest (that is, 0.06 3 $1,000 5
  99. Chemistry

    I recently performed an experiment in which magnesium oxide formed. I have to find out the simplest whole number ratio of Mg atoms to O atoms. How do I go about doing this? * Chemistry - DrBob222, Tuesday, October 13, 2009 at 11:19pm Mass MgO - mass Mg
  100. mathematics literacy

    There are seven red peppermints in a packet of 22 peppermints.what percentage of the peppermints are red?