Supoose a population has a mean weight of 180 pounds and a s

Supoose a population has a mean weight of 180 pounds and a standard deviation of 25 pounds. A sample of 100 items is drawn form this population. What is the standard error of the mean? 1.8, 2.5, 18.0, or 0.25

Solution

Standard Error= sd/ Sqrt(n)
Where,
    sd   = Standard Deviation
    n = Sample Size

Standard deviation( sd )=25
Sample Size(n)=100
Standard Error = ( 25/ Sqrt ( 100) )
= 2.5