Consider the following.
(a) The empirical rule indicates that we can expect to find approximately what percentage of the sample included between x ? s and x + s?
%
(b) The empirical rule indicates that we can expect to find approximately what percentage of the sample included between x ? 2s and x + 2s?
%
(c) The empirical rule indicates that we can expect to find approximately what percentage of the sample included between x ? 3s and x + 3s?