1. Find the standard? deviation:
Interval 30-39 40-49 50-59 60-69 70-79 80-89
Frequency 3 22 38 24 10 4
2. Heights of men on a baseball team have a? bell-shaped distribution with a mean of 177 cm and a standard deviation of 8 cm.Using the empirical? rule, what is the approximate percentage of the men between the following? values?
a. % of the men are between 161 cm and 193 cm
b. % of the men are between 169 and 185 cm