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?

Answer 1

If the variance is 0.0004, the standard deviation is the square root of that, or 0.02.

Using the computational tool at
http://psych.colorado.edu/~mcclella/java/normal/accurateNormal.html ,

the probability is 9.1%