| 1. |
Ranger Roger has counted about 30% of the scrum trees in Vista Park today. He has this chore of counting the 1,200 scrum trees three times a year. If this is his second count this year, what fraction of the total number of scrum trees has he counted so far?
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| 2. |
One-third of the class grew peas, one-third grew carrots, and one-third grew beans. The class consisted of 63 students of which four-sevenths were girls. The teacher chose the three groups to be as equal in their boy-girl composition as possible. How many boys and girls were assigned to each team?
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| 3. |
If 91 out of 100 grasshoppers are immune to a pesticide after five years of use, how many would be expected to be immune in a population of 2.4 million after five years of use?
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| 4. |
If one-fourth of all type-Y organisms are bristly and five-sixths of all type-Y organisms are wrinkly, what is the maximum number of type-Y organisms that are neither bristly nor wrinkly out of a sample population of 1,558?
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| 5. |
In an introductory biology lab, students are asked to determine the average length of the red earthworm. Working in teams, they reported the data in Table 1. At the end of the experiment, the teams combined their data to find the overall average. What was the overall average? Round your answer to the nearest tenth.
Table 1| Team # | Average length (cm) | # of worms measured | | 1 | 5 1/5 | 4 | | 2 | 6 1/5 | 5 | | 3 | 8 5/8 | 4 |
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| 6. |
In a herd of 970 zebras, about two-fifths of one percent of all animals are injured crossing a stream. How many are injured?
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