Here you are dealing with means rather than individual scores.
Z = (score-mean)/SEm
SEm = SD/√n
Use same table as indicated in your later post.
a final exam in statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?
2 answers
where is this formula located on excel?
2 answers