# What is the standard deviation?

*label*Mathematics

*timer*Asked: May 8th, 2015

**Question description**

The number of flaws per square yard in a type of carpet material varies with mean 1.5 flaws per square yard and standard deviation 1.3 flaws per square yard. An inspector studies 200 square yards of material and calculates the average number of flaws per square yard called x-bar. What is the standard deviation of the sample mean x-bar (round to 5 decimal places)?