Based upon extensive data from a national high school educational testing program, the standard deviation of national test scores for critical reading was found to be 115 points. if a sample of 500 students are given the test, what would be the standard error of the mean? (rounded to the nearest 100th)

The standard error of the mean is 10.11 points

Step-by-step explanation:

Standard error of mean = t×sd/√n

sd = 115 points, n = 500, degree of freedom = n-1 = 500-1 = 499, assuming a 95% confidence level, t-value corresponding to 499 degrees of freedom and 95% confidence level is 1.96501

Standard error of mean = 1.96501×115/√500 = 10.11 points (to the nearest 100th)

the least common denominator is 40