Using the Empirical Rule Quick
Check
I
It is estimated that about 99.7% of observations are
expected to fall between 3 standard deviations below
and above the mean.
What percent of observations are expected to fall
between 2 and 3 standard deviations above (or below)
the mean?
05%
68%
0 4.7%
95%
2.5%
2.35%
99.7%
13.5% 34% 34% 13.5% ?
μ-30 μ-2σ μ-Ο
to +20 +30