The diameter of a pipe is normally distributed with a mean of 0.4 inches and a variance of 0.0004. What is the probability that the diameter of a randomly selected pipe will exceed 0.44 inches?
3 answers
If no one who teaches this shows up to help, I will get out my normal distribution tables and try later.
As Damon suggested, these are done using Normal distribution tables.
Personally I don't see the difference in using tables or computer programs that do the same thing.
My personal choice is
http://davidmlane.com/hyperstat/z_table.html
If I recall correctly, there is a difference in "variance" and "standard deviation"
check in your textbook
Personally I don't see the difference in using tables or computer programs that do the same thing.
My personal choice is
http://davidmlane.com/hyperstat/z_table.html
If I recall correctly, there is a difference in "variance" and "standard deviation"
check in your textbook
the standard deviation is the square root of the variance.