Sixty-five elements were randomly sampled from a population that has 200 elements. the sample mean is 180 with a variance of 135. the distribution of the population is unknown. the standard error of the mean is

Sample size = 65

mean = 180

variance = 135

Standard Deviation is square root of the variance. So standard deviation = 11.6

Standard Error of the mean = Standard Deviation / square root of sample size

= 11.6 / 8.06 = 1.44