SOLUTION: three adult males in the 20-29 age group are randomly selected. Their heights are 74 inches, 66 inches, and 68 inches. Use z-scores to determine which heights, if any, are unusual.

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Question 848931: three adult males in the 20-29 age group are randomly selected. Their heights are 74 inches, 66 inches, and 68 inches. Use z-scores to determine which heights, if any, are unusual.
Answer by swincher4391(1107) (Show Source):
You can put this solution on YOUR website!
The way you have this stated is impossible to solve. You did not give the population mean or standard deviation. This is important to know. After digging, I have found a question similar to this one and will answer it instead.
Three adult males in the 20�29 age group are randomly selected. The distribution of heights is normal and has mean 69 inches and a standard deviation of 3. Their heights are 70 inches, 66 inches, and 68 inches. (from Elementary Statistics: Picturing the World)
Z score for 70: (70-69)/3 = 1/3
Z score for 66: (66-69)/3 = -1
Z score for 68: (68-69)/3 = -1/3
None of these are unusual since it would have to have a z-score > 3