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Pourcentages
Mathématiques
Middle School Math
Pourcentages

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 Name _____________________________ Date ___________________
Pourcentage
Complète.
 1 Jessica currently has an average of 89% on her three math tests this year. If one of her test grades was 89% and another was 88%, what was the grade of her third test?
 2 If the probability of a particular species of caterpillar having purple spots isthree-fourths, what percent of the caterpillars of that species that hatched this season would we expect to see with purple spots?

Complète.
 1 La population initiale de protista dans une culture est4,695. La population finale après une semaine était8,092. De quel pourcentage la population a-t-il augmenté pendant la semaine ? Arrondis ta réponse au centième d'un pourcentage le plus proche.
 2 Le nombre de coyotes aux alentours de Grandeville a changé au fils des années. Pendant le sondage précédent, qui a été éffecuté il y a deux ans, on estimés à508le nombre de coyotes. Le sondage le plus récent indique que la population des coyotes a augmenté de5%. Si cela est vrai, combien peut-on estimer le nombre de coyotes aux alentours de Grandeville ?

Complète.
 1 Soils with a lot of clay hold more water than soils that have less clay. Let's say you have two soil samples of equal mass (20grams each) that are composed mostly of sand and clay. Sample one is found to be19% water and sample two is found to be16% water. If you had to make a choice, which one do you think had the most clay in it?
 2 Z-Globe sent a submarine to the bottom of the Pacific Ocean off the coast of California. Its mission was to collect some rocks for radiometric dating. It was in a fairly shallow place and the water was only315m deep. It was well within the submarine's safe operating depth. In fact the submarine was capable of diving to a depth of2,000m. At what percent of the safe operating depth was the sub operating during its mission off the coast of California? Round your answer to the nearest tenth of a percent.

 Key #2
Complète.
 1 Mr. Bloop drives20kilomètres à une vitesse moyenne de52km/hr. Mrs. Bloop drives the same distance at an average speed that is2% faster than Mr. Bloop's. How long does it take her to travel the 20 km distance? Round your answer to the nearest hundredth of a minute.
 2 Racer Joe made four laps around Smallville racetrack with an average speed of178.7miles per hour. Speedy Bob made a set of four laps with an average speed of184.5miles per hour. Bob's speed was what percent of Joe's speed? Round your answer to the nearest hundredth of a percent.

Complète.
 1 Jessica performed an analysis on some water from Bigtown Lake. She tested five samples and found the lead concentrations to be in parts per million (micrograms per milliliter or mg per liter) to be1.004,1.048,0.026,0.018, and1.028respectively. What was the average mass of lead? Round your answer to the nearest thousandth.
 2 Sydney is concentrating a sample by distillation. She started with110ml d'une solution qui était environ0.12% inorganic salts. After several hours of distillation the amount of inorganics salts hasn't changed, but the volume had been decreased to60ml. What percent of the solution after distillation is inorganic salts? Round your answer to the nearest hundredth of a percent.

Complète.
 1 Brittany went to bat21fois la saison dernière et a frappé la balle10times. This season she went to bat32times and hit the ball the same number of times as she did last season. Her hitting percent this season was what percent of last season's? Round your answer to the nearest tenth of a percent.
 2 Attendance is up at the local minor league stadium this year. Last year there was an average of3,231fans per game. This year the average has been4,833. What percent increase has occurred? Round your answer to the nearest hundredth of a percent.

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