Chapter 6

Identify each sample as biased or unbiased and describe its type. Explain your reasoning. To determine how many students at a middle school bring their lunch from home, all the students on one school bus are surveyed.

Solve each problem using the percent equation. What is \(20 \%\) of \(110 ?\)

Find the percent of change. Round to the nearest tenth, if necessary. Then state whether the percent of change is a percent of increase or a percent of decrease. from \(\$ 50\) to \(\$ 67\)

Use the percent proportion to solve each problem . 16 is what percent of 40?

Determine whether the set of numbers in each table is proportional. $$\begin{array}{l|c|c|c|c|}\hline \text { Blue Paint (quarts) } & 1 & 2 & 3 & 4 \\ \hline \text { Yellow Paint (quarts) } & 5 & 6 & 7 & 8 \\\\\hline\end{array}$$

On a map of South Carolina, the scale is 1 inch \(=20\) miles. Find the actual distance for each map distance. $$\begin{array}{|l|l|c|}\hline \text { From } & \text { To } & \text { Map Distance } \\\\\hline \text { Columbia } & \text { Florence } & \text { 4 inches } \\\\\hline \end{array}$$

Express each percent as a fraction or mixed number in simplest form and as a decimal. $$30 \%$$

Find the percent of each number mentally. $$75 \% \text { of } 64$$

Solve each proportion. $$\frac{k}{35}=\frac{3}{7}$$

Express each ratio as a fraction in simplest form. 4 goals in 10 attempts

Identify each sample as biased or unbiased and describe its type. Explain your reasoning. To determine the theme for the homecoming dance, the homecoming committee surveys one classroom.

Solve each problem using the percent equation. Find \(28 \%\) of 158

Find the percent of change. Round to the nearest tenth, if necessary. Then state whether the percent of change is a percent of increase or a percent of decrease. from \(\$ 228\) to \(\$ 251\)

Use the percent proportion to solve each problem. 18 is what percent of \(72 ?\)

Determine whether the set of numbers in each table is proportional. $$\begin{array}{|l|l|l|l|l|}\hline \text { Ice Tea Mix (cups) } & 1 & 2 & 3 & 4 \\\\\hline \text { Sugar (cups) } & 2 & 4 & 6 & 8 \\\\\hline\end{array}$$

On a map of South Carolina, the scale is 1 inch \(=20\) miles. Find the actual distance for each map distance. $$\begin{array}{|l|l|c|}\hline \text { From } & \text { To } & \text { Map Distance } \\ \hline \text { Myrtle Beach } & \text { Greenville } & 12 \frac{1}{2} \text { inches } \\\\\hline\end{array}$$

Find the percent of each number mentally. $$25 \% \text { of } 52$$

Express each percent as a fraction or mixed number in simplest form and as a decimal. $$65 \%$$

Express each ratio as a fraction in simplest form. 15 dimes out of 24 coins

Identify each sample as biased or unbiased and describe its type. Explain your reasoning. To determine shopping habits at a department store, one male and one female shopper are randomly selected and surveyed from each of their 75 stores.

Solve each problem using the percent equation. 15 is what percent of \(60 ?\)

Find the percent of change. Round to the nearest tenth, if necessary. Then state whether the percent of change is a percent of increase or a percent of decrease. from 45 in. to 18 in.

Use the percent proportion to solve each problem. What percent of 5 is \(14 ?\)

The cost of 13 gallons of gasoline is 32.37 dollars. Write an equation relating cost to the number of gallons of gasoline. How much does 18.5 gallons of gasoline cost?

The Statue of Zeus at Olympia is one of the Seven Wonders of the World. On a scale model of the statue, the height of Zeus is 8 inches. If the actual height of Zeus is 40 feet, what is the scale of the statue?

Find the percent of each number mentally. $$33 \frac{1}{3} \% \text { of } 27$$

Express each percent as a fraction or mixed number in simplest form and as a decimal. $$12 \frac{1}{2} \%$$

Express each ratio as a fraction in simplest form. 10 inches to 3 feet

Find the percent of change. Round to the nearest tenth, if necessary. Then state whether the percent of change is a percent of increase or a percent of decrease. from \(80 \mathrm{cm}\) to \(55 \mathrm{cm}\)

Solve each problem using the percent equation. 12 is what percent of \(400 ?\)

Use the percent proportion to solve each problem. What percent of 8 is \(20 ?\)

Determine whether the set of numbers in each table are proportional. $$\begin{array}{l|c|c|c|c|}\hline \text { Cans of Concentrate } & 1 & 2 & 3 & 4 \\\\\hline \text { Cans of Water } & 4 & 8 & 12 & 16 \\\\\hline\end{array}$$

Find the percent of each number mentally. $$90 \% \text { of } 80$$

Express each percent as a fraction or mixed number in simplest form and as a decimal. $$62 \frac{1}{2} \%$$

A 3-inch by 5-inch photo is enlarged so that the length of the new photo is 7 inches. Find the width of the new photo.

Express each ratio as a fraction in simplest form. 5 feet to 5 yards

Identify each sample as biased or unbiased and describe its type. Explain your reasoning. To determine what type of food people in a community like, Brad surveys \(10 \%\) of the people who enter 5 different fast food restaurants.

Solve each problem using the percent equation. 30 is \(60 \%\) of what number?

Determine whether the set of numbers in each table are proportional. $$\begin{array}{l|c|c|c|c|}\hline \text { Shaded Squares } & 1 & 2 & 3 & 4 \\\\\hline \text { Total Squares } & 8 & 15 & 30 & 42 \\\\\hline\end{array}$$

Use the percent proportion to solve each problem. What is \(80 \%\) of \(130 ?\)

Estimate. Explain which method you used to estimate. $$20 \% \text { of } 61$$

Express each percent as a fraction or mixed number in simplest form and as a decimal. $$125 \%$$

The distance between Tallahassee and Miami is 478 miles. Find the distance in kilometers if \(1 \mathrm{mi}=1.609 \mathrm{km} .\) Round to the nearest kilometer.

Express each rate as a unit rate. Round to the nearest tenth, if necessary. \(\$ 183\) for 4 concert tickets

Identify each sample as biased or unbiased and describe its type. Explain your reasoning. To determine the quality of cell phones coming off an assembly line, the manager chooses one cell phone every 20 minutes and checks it.

On a set of architectural drawings for a new school, the scale is \(\frac{1}{2}\) inch \(=\) 9 feet. Find the actual length of each room. $$\begin{array}{|l|c|}\hline \quad \quad \quad \text { Room } & \text { Drawing Distance } \\ \hline \text { Classroom } & 5 \text { inches } \\\\\hline\end{array}$$

ANIMALS In 2000 , there were 356 endangered species in the United States Five years later, 389 species were considered endangered. What was the percent of change?

Determine whether the set of numbers in each table are proportional. $$\begin{array}{|l|l|l|l|l|}\hline \text { Junk E Mails } & 10 & 20 & 30 & 40 \\\\\hline \text { Total E Mails } & 15 & 30 & 45 & 60 \\\\\hline\end{array}$$

Use the percent proportion to solve each problem What is \(74 \%\) of \(56 ?\)

Solve each problem using the percent equation. 150 is \(75 \%\) of what number?