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¹ Lee, J.Y. (2013). “Private tutoring and its impact on students' academic achievement, formal schooling, and educational inequality in Korea.” Unpublished doctoral thesis. Columbia University.
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is a random variable with a mean of 
and standard deviation of 
, what is the mean and standard deviation of 
?
, such that
has mean 
and variance 
,
has mean 
and variance 
,
has mean 
and variance 
.
, is less than 
?