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There are 1200 trees in an apple orchard. The owner randomly examined 20 trees and found 3 of them are infested. What is the expected number of infested trees in the orchard?

 Jun 15, 2019
edited by Rudram592  Jun 15, 2019
 #1
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Using the ratio, 180 of them are infected. Probably. It's just the expected value.

Hope this Helps.... :P

 Jun 15, 2019
edited by NoobGuest  Jun 15, 2019
 #2
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Or, Using a tiny probabilty, the Famer just found 3/3 infected trees, but 180 infected has my best bets.

NoobGuest  Jun 15, 2019
 #3
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If 3/20 trees are infested and there are 1200 trees total, then 3/20*1200=180 so there should be around 180 infested trees.

 

You are very welcome!

:P

 Jun 15, 2019

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