Iteration

1. Write a for loop that calculates the mean bill length for each species in the penguins data set (don’t use group_by()) and saves them as species_means.

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2. Create a list penguins_island that separates the penguins data by island.

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3. Apply map() to find the number of observations for each year.

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4. Apply map() to calculate the mean body weight for each island.

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5. Rework #5 to return a numeric vector with values rounded to 1 decimal place.

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