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Question

A sample of n = 12 scores has ∑X = 72. What is the sample mean?

Answer 1

Question: A sample of n = 12 scores has ∑X = 72. What is the sample mean?

Answer: Remember that in order to find the mean, you add the observations given to you, and then divide that sum by the number of observations you have. Here, your observations add to 72 (that is what the ∑X = 72 statement means), and you have 12 observations (that is what the n = 12 statement means). So, you do 72 / 12, which is 6.