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frew@mclean.com unit3virtualbonus > averageLength
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Returns an average length of its four String parameters


averageLength("a", "b", "c", "d") → 1.0
averageLength("hello", "ae", "ab", "abc") → 3.0
averageLength("good", "morning", "to", "you!") → 4.25

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public double averageLength(String str1, String str2, String str3, String str4) { }

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