Asked by erica

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?
Answered by PsyDAG
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.
Answered by erica
where is this formula located on excel?
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