Robins are common birds in North America. Suppose that the wingspan of robins is approximately normal with mean 14 inches and standard deviation 0.7 inches. Write the formula or explain your steps (8 pts)

a.	What proportion of robins have wingspans between 12.5 and 13.5 inches? Round your answer to three decimal places.

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b.	What is the 30th percentile of robin wingspans? Round your answer with two decimal places.

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