There are on average 20 old growth sitka spruce trees

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Question 18 of 200.0/ 1.0 PointsThere are on average 20 old growth Sitka Spruce trees per acre in a local forest. Find the probability that that there are more than 8 Sitka Spruce trees in a ¼ acre. Round answer to 4 decimal places. Answer: 0.9979
Part 6 of 6 - Probability2.0/ 2.0 PointsQuestion 19 of 201.0/ 1.0 PointsOn a baseball team, there are infielders and outfielders. Some players are great hitters, and some players are not great hitters. Let I = the event that a player in an infielder. Let O = the event that aplayer is an outfielder. Let H = the event that a player is a great hitter. Let N = the event that a player is not a great hitter. Write the symbols for the probability that a player is an outfielder or isa great hitter.
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Question 20 of 201.0/ 1.0 PointsIf A and B are any two events with P(A) = .8 and P(B|A) = .4, then the joint probability of A and B is: