Explanation
The Empirical Rule states that:
• about 68% of values fall within one standard deviation of the mean,,
,
• about 95% of the values fall within two standard deviations from the mean,
,
• almost all of the values—about 99.7%—fall within three standard deviations from the mean.
According to this, to have at least 99.0% of the data inside our interval, we must select approximately k = 3 standard deviations.
Answer
• A. Use the Empirical Rule
,
• k = 3
