Just to understand better standard deviation :
Factory X has a daily revenue of $7000. The standard deviation is $2000. Revenue on successive days is independent.
What is the total expected revenue for three days and what is the standard deviation after three days? the same ?
Factory X has a daily revenue of $7000. The standard deviation is $2000. Revenue on successive days is independent.
What is the total expected revenue for three days and what is the standard deviation after three days? the same ?