The word that best describes the tone in this stanza is: happy.
This stanza was taken from the poem I Hear America Singing, by Walt Whitman. It's a poem of patriotism, of pride of each and every person who helps build America and make it what it is. Everyone is important: the carpenters, the mechanics, the masons, the mothers, the wives. All of them sing their melodious songs of freedom and opportunity.
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A frequency distribution is a representation, either in a graphical or tabular format, that displays the number of observations within a given interval. ... The intervals must be mutually exclusive and exhaustive. Frequency distributions are typically used within a statistical context.