A sample of 30 professional men was asked to estimate their yearly expenditures on clothes for work.The data are summarized in the following stem-and-leaf display. Stem = 100 Leaf = 10 
What percentage of these men spent more than $600 and less than $700 on professional attire? (Round to nearest tenth of a percent. )
Definitions:
Serotonin
A neurotransmitter that plays a key role in regulating mood, appetite, and sleep, among other functions, often associated with feelings of well-being and happiness.
Neurotransmitter
A chemical substance that transmits signals across a synapse from one neuron to another.
Glutamate
An important neurotransmitter in the brain involved in learning and memory.
Melatonin
A hormone produced by the pineal gland that regulates sleep and wakefulness.
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