Asked by Luis

A population has u=100 and o=20. If you select a single score from this population, on average, how close would it be to the population mean? Explain your answer.

I don't understand the question itself. Please help.
Answered by PsyDAG
Do you know the 68-95-99.7 rule? Approximately 68% of scores in normal distribution are within one standard deviation (34% on each side of the mean), 95% within 2 SD, and 99.7% within 3 SD.
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