Question

1. 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.

2. a) The largest 20% of robins have wingspans longer than what value? Report your answer with two decimal places.

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

4. c) What proportion of robins have wingspans between 12.5 and 13.5 inches? Report your answer with three decimal places.

5. d) What proportion of robins have wingspans less than 13 inches? Report your answer with three decimal places.

6. e) What proportion of robins have wingspans longer 15.5 inches? Report your answer with three decimal places.

Answer 1