Why the textbook says that SAT scores is a Symmetric (Unimodal) distribution?
SAT score have score scales . A large number of candidates give SAT test and get SAT score . If we calculate the mean , median and mode of this score all of them will fall exactly at same point .
As population size is very large ... That means students scoring less than that mean score is equal to the students scoring more than the mean is exactly same .
So it is symmetric distribution ( oftenly normal distribution ) .
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