The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 250.8
and a standard deviation of 65.5.
(All units are 1000 cells/L.)
Using the empirical rule, find each approximate percentage below.
a.What is the approximate percentage of women with platelet counts within 1
standard deviation
of the mean, or between 185.3
and 316.3?
b.What is the approximate percentage of women with platelet counts between 54.3
and 447.3?
