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What is an outlier for a random variable?
Data point that is outside 2 standard deviations away from the mean
Data point that is outside 3 standard deviations away from the mean
Data point that is less than 2 percentile or greater than 98 percentile
None of the above
What is a random variable?
A variable that follows normal distribution
A variable that follows normal distribution with mean 0 and standard deviation of 1
A variable whose possible values depend, in some clearly-defined way, on a set of random events
A variable whose value is thus known a priori (before the outcome of the events is known).
 
 
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