The diameter of an electric cable is normally distributed, with a mean of 0.8 inch and a standard deviation of?

.83 is .03 above the mean of .8

since the standard deviation is .01, then the deviation you are looking for is 3 standard deviations

You can look up the probability of a sample from any normal distribution being 3 or more standard deviations from the mean.

here are some

http://www.math.unb.ca/~knight/utility/NormTble.ht...

according to the "far right table"

with z=3

3.0 -- 0.001350

the probability is .001350

or .1350%

ultimate me if i'm incorrect, yet do no longer non-cease threat distributions have 0 threat at a component? you could in easy terms communicate approximately possibilities of periods. If the question were a minimum of four.5 or at maximum 4.5... Pr (Diam = 4.5) = 0