Solution
The total frequency is:
3+ 7+16+ 20+ 23 =69
The relative frequency for this case is:
zinnias= 3/69 = 0.0435 = 4.35%
gladiolas = 7/69= 0.101 = 10.1%
marigold = 16/69= 0.232 = 23.2%
hollyhocks = 20/69= 0.290 = 29.0%
lilies = 23/69= 0.333 = 33.3%