For a normal curve, what percentage of values falls beyond two standard deviations from the mean?
A. 5.55%
B. 4.55%
C. 10.55%
D. 12.55%
E. 13.11%
B is the best answer.
To answer this question, we need to understand the properties of a normal curve. In a normal distribution, approximately 68% of values fall within one standard deviation of the mean, approximately 95% fall within two standard deviations, and approximately 99.7% fall within three standard deviations.
So, the percentage of values that fall beyond two standard deviations from the mean would be the percentage of values that fall outside the range between the mean plus or minus two standard deviations.
Since we know that approximately 95% of values fall within two standard deviations, the percentage of values that fall beyond two standard deviations would be 100% - 95% = 5%.
Therefore, the correct answer is option A. 5.55%.