For a normal distribution, about what proportion of data lies within one standard deviation of the mean?
Answer and explanation
Correct answer: A. About 68 percent of the values, nearly seven in ten
- Step 1: The empirical rule gives 68, 95 and 99.7 percent for one, two and three standard deviations. Step 2. One standard deviation matches 68 percent. Answer: 68 percent. Why not the others: 95 and 99.7 belong to two and three standard deviations.
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