SOLUTION: If the random variable z is the standard normal score, is it true that P(-3 < z < 3) could easily be approximated without referring to a table? Why or why not?

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Question 422384: If the random variable z is the standard normal score, is it true that P(-3 < z < 3) could easily be approximated without referring to a table? Why or why not?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

If the random variable z is the standard normal score, is it true that P(-3 < z < 3)

could easily be approximated without referring to a table? YES

Three SDs from the mean account for ~99.7% of the entire distribution

thus a probalility ~ .99