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Percent
Complete.
1.   Edgewater Elementary School recently participated in a survey done by the local university. The College of Education had made an arrangement with our principal for the survey. They wanted to determine if students thought male teachers or female teachers were more lenient. 31% of the students thought female teachers were more lenient, 15% said they were the same, 3% had no opinion, and the rest of the students said male teachers were more lenient. On the day of the survey, there were three hundred seventy-six students at school. How many said male teachers were more lenient?

2.   Twenty-one percent of the plants in the park are broad-leafed plants and the rest are grasses. What percent of the plants are grasses?


Complete.
1.   Stephanie is performing an experiment using gel electrophoresis. She is monitoring the migration of RNA through the gel. The shortest fragments of RNA have traveled 4.4 cm through the gel and the longest fragments have traveled only 1.6 cm. The longest fragments have traveled what percent of the distance of the shortest fragments? Round your answer to the nearest hundredth of a percent.

2.   If eleven out of thirteen skinks have stripes and the rest don't, what percent of the skinks do not have stripes out of a population of 127 skinks? Round your answer to the nearest tenth of a percent.


Complete.
1.   Two islands have been monitored for many years. Smooth Beach Island seems to be getting closer to the North Pole by about 3.5 cm per year. Big Tree Island is getting close to the North Pole by about 24% less distance than Smooth Beach Island each year. What is Big Tree Island' rate of movement in the direction of the North Pole? Round your answer to the nearest hundredth.

2.   In Bigtown Creek the flow of sediment is slowly decreasing as more and more of the drainage area around the creek is developed and covered by concrete. Ten years ago a measurement was made by the local university and an average mass of about 14 grams of sediment per hour was moving down the creek. Now the average sediment flow is only about 37% of that. What is the current mass sediment flow? Round your answer to the nearest tenth.


 

Key #2
aKey #2
Complete.
1.   Two objects are suspended 5 meters in the air by a string. One object has a mass of 3 kg and the other has a mass of 3.5 kg. What is the difference in potential energy of the two objects expressed as a percent? Round your answer to the nearest hundredth of a percent if needed.

2.   The pressure at which a liquid boils is by definition the pressure that equals the atmospheric pressure pushing back on the surface of the liquid. Water boils at 100C at sea level where the pressure is 1 standard atmosphere. If at a higher altitude the water boils at 99.2C, the pressure must then be a bit less than 1 atmosphere. In this example, by what percent did the boiling temperature change? Round your answer to the nearest hundredth of a percent.


Complete.
1.   Grace is concentrating a sample by distillation. She started with 110 ml of a solution that was about 0.04% inorganic salts. After several hours of distillation the amount of inorganics salts hasn't changed, but the volume had been decreased to 50 ml. What percent of the solution after distillation is inorganic salts? Round your answer to the nearest hundredth of a percent.

2.   Courtney performed an analysis on some water from Bigtown Lake. She tested four samples and found the lead concentrations to be in parts per million (micrograms per milliliter or mg per liter) to be 1.035, 1.028, 1.015, and 1.026 respectively. What was the average mass of lead? Round your answer to the nearest thousandth.


Complete.
1.   If a baseball team begins the season with 5,000 baseballs, and at the end of the season they have 1,983, what percent of the balls are gone? Round your answer to the nearest tenth of a percent.

2.   Taylor is a good scorer for her soccer team. She scored 10 goals during regular play, and she scored 3 on penalty kicks. What percent of her goals did not result from penalty kicks? Round your answer to the nearest tenth of a percent.


 


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