In a sample of 200 observations, there were 80 positive outcomes. Find the standard error for the sample proportion.
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Since they mowed 
of the lawn in two equal parts, we need to split the pieces that were mowed into two equal groups. We know that in total they mowed 8 out of the total 9 pieces of lawn, so two equal groups that make 8 would be of size 4, since 
. Then they each mowed 
of the lawn.