CD4 cells, a type of white blood cells, have an important role in fighting infection. CD4 counts are used for diagnosing AIDs and monitoring the progression of autoimmune disease. CD4 counts in healthy adults can vary greatly. For example, in New Delhi, investigators have reported the average CD4 count among healthy adults is (mu=) 703 cells/mL with standard deviation (sigma=) 225 cell/mL. Assume the CD4 counts in this population are normally distributed. 100 adults from New Delhi are selected from this population. Find the standard error for CD4 counts