Question: The St. Joe Company grows pine trees and the average annual increase in tree diameter is 3.1 inches with a standard deviation of 0.5 inch.

The St. Joe Company grows pine trees and the average annual increase in tree diameter is 3.1 inches with a standard deviation of 0.5 inch. A random sample ofn= 50 trees is collected.

What is the probability of the sample mean being less the 2.9 inches?

0.4977

0.9977

0.9954

0.0023

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