The compressive strength of concrete is normally distributed

The compressive strength of concrete is normally distributed with mean µ = 2500 and standard deviation = 50. Random sample of size 5 is taken. What is the standard error of the sample mean?

Solution

What is the standard error of the sample mean?

Serror of the sample mean is calculated by sigma / srqt(n)

Se = sigma / sqrt (n) = 50 / sqrt (5) = 22.36