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A forest type consists of three species of trees: 25% are Douglas-fir 40% are Hemlock 35%...

A forest type consists of three species of trees:

  • 25% are Douglas-fir

  • 40% are Hemlock

  • 35% are Western Red Cedar

a. What is the probability that a tree selected at random will be a Douglas- fir?

b. What is the probability that a tree selected at random will not be a Hemlock?

c. If it is known that the tree selected is not a Hemlock, what is the probability that it is not Western Red Cedar either?

Math   Statistics-And-Probability   
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