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20) The DBHs (Diameters at Breast Height) of the trees in Question 1 (Douglas-firs and Hemlocks...

20) The DBHs (Diameters at Breast Height) of the trees in Question 1 (Douglas-firs and Hemlocks taken together) are normally distributed with an average of 20 cm and a standard deviation of 5 cm. What is the probability that the researcher will select a tree that is...

a) ...less than 15 cm in diameter?

b) ...between 15 and 20 cm in diameter?

c) ...greater than 20 cm in diameter?

d) ...less than 15 cm or greater than 20 cm in diameter?

Math   Statistics-And-Probability   
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