The mean birth weight for children born in a certain country at full term (after 40 weeks) is 3470 grams (about 7.7 pounds). Suppose the standard deviation is 500 grams and the shape of the distribution is symmetric and unimodal. A. What is the range of birth weights (in grams) of children born from one standard deviation below the mean to one standard deviation above the mean?
- The top value is __
- The bottom value is __

Spider crabs live in the shallow regions of the ocean floor. algae tend to grow on the surface of spider crabs. the algae provide the crabs protection from predators by camouflaging them. the spider crabs give the algae shelter. what does this description suggest? 1. the algae are parasites of the spider crabs. 2. the algae and the spider crabs have a mutualistic relationship. 3. the spider crabs are commensals, and the algae are parasites. 4. the spider crabs benefit from the algae living on them. 5. the spider crabs are parasites of the algae.

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What is 7/81 as a percentage? round your answer to the nearest tenth of a percent.