Examples of percent in the following topics:
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- Percent dissociation is symbolized by the Greek letter alpha, α, and it can range from 0%< α < 100%.
- To determine percent dissociation, we first need to solve for the concentration of H+.
- As we would expect for a weak acid, the percent dissociation is quite small.
- However, for some weak acids, the percent dissociation can be higher—upwards of 10% or more.
- Calculate percent dissociation for weak acids from their Ka values and a given concentration.
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- Butane's percent composition can be calculated as follows:
- Mass percent H in butane: $\frac{10.079\:g\:H}{58.123\:g\:butane} \cdot 100$ = 17.3% H
- Mass percent C in butane: $\frac {48.044\:g \:C}{ 58.123 \:g \:butane} \cdot 100$ = 82.7% C
- This video shows how to calculate the percent composition of a compound.
- Translate between a molecular formula of a compound and its percent composition by mass
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- The percent yield of a reaction measures the reaction's efficiency.
- Then, percent yield can be calculated.
- If 18.0 grams were actually produced, the percent yield could be calculated:
- It also shows how to calculate the limiting reactant and the percent yield in a chemical reaction.
- Calculate the percent yield of a reaction, distinguishing from theoretical and actual yield.
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- The percentage of people living below the poverty level dropped from 22.4 percent in 1959 to 11.4 percent in 1978.
- In 1998, it stood at 12.7 percent.
- Partly as a result of this phenomenon, almost one in five children (18.9 percent) was poor in 1997.
- The poverty rate was 36.7 percent among African-American children and 34.4 percent among Hispanic children.
- In contrast, the poorest one-fifth earned just 4.2 percent of the nation's income, and the poorest 40 percent accounted for only 14 percent of income.
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- r2 is called the coefficient of determination. r2 is the square of the correlation coefficient , but is usually stated as a percent, rather than in decimal form. r2 has an interpretation in the context of the data:
- r2 , when expressed as a percent, represents the percent of variation in the dependent variable y that can be explained by variation in the independent variable x using the regression (best fit) line.
- 1-r2 , when expressed as a percent, represents the percent of variation in y that is NOT explained by variation in x using the regression line.
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- One commonly used method is to compare the wealth of the richest ten percent with the wealth of the poorest ten percent.
- A study by the World Institute for Development Economics Research at the United Nations reports that the richest 1 percent of adults owned 40 percent of global assets in the year 2000, and that the richest 10 percent of adults accounted for 85 percent of the world total.
- The bottom half of the world adult population owned 1 percent of global wealth.
- For example, 10 percent of land owners in Baltimore, Maryland own 58 percent of the taxable land value.
- The bottom 10 percent of those who own any land own less than 1 percent of the total land value.
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- Figure 3, for example, shows percent increases and decreases in five components of the CPI.
- A bar chart of the percent change in the CPI over time.
- Each bar represents percent increase for the three months ending at the date indicated.
- A line graph of the percent change in the CPI over time.
- A line graph of the percent change in five components of the CPI over time.
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- About half of all households are aged 45 and older and growing at an annual rate of one percent compared with nearly two percent in the 1980s.
- Most adults in the United States still have not completed college (approximately 67 percent), but that number continues to decline.
- The share of aggregate household income earned by the middle 60 percent of households has shrunk from 52 percent in 1973 to 49 percent 25 years later.
- Meanwhile, the share of such income earned by the top 20 percent (average income USD 98,600) increased from 44 percent to 48 percent.
- In other words, the total purchasing power of the top 20 percent of US households now equals that of the middle 60 percent.
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- Voter turnout among eighteen- to twenty-four-year-olds dropped from 50 percent in 1972, the first presidential election year after the voting age was lowered to eighteen, to 36 percent in 2000.
- Turnout among senior citizens, people sixty-five and older, increased to nearly 70 percent in that same time period.
- Young voter turnout rose to 47 percent in 2004 and 51 percent in 2008, partly as a result of voter registration and mobilization efforts by groups like Rock the Vote.
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- Write this percent below.
- Is the percent of confidence intervals that contain the population mean µ close to 90%?
- What do you think would happen to the percent of confidence intervals that contained the population mean?
- What percent is this?
- Is this percent close to 90%?