Slightly more than 20 are less than 6 feet ( 1.8 m ) high , 5 are 6 to 9 feet ( 1.8 to 2.7 m ) high .
Approximately two are over 9 feet ( 2.7 m ) high .
Slightly more than 20 are less than 6 feet ( 1.8 m ) high , 5 are 6 to 9 feet ( 1.8 to 2.7 m ) high , and approximately two are over 9 feet ( 2.7 m ) high .