for part b , why the distribution is x̅ ~N( 2, 131/150 ) why not x̅ ~N( 2.3 , 131/150 ) ? for part c , why 2 is used as mean in P(Y>0) ?? why not 2.3 ?? i am totally confused by the ans given..
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You missed the class where he said "the mean is 2 not 2.3"
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